Malicious PDF — malware analysis report

Static analysis result for SHA-256 637d7e29f03da214…

MALICIOUS

PDF

143.2 KB Created: 2021-05-28 19:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 546a2953962aab1c632a1f067b226c6b SHA-1: 4b5f557b6d23b0c598408d7ec31d5ee45cdffd04 SHA-256: 637d7e29f03da21485267ab8e6dec71007a1f1d34b95f3724a0c6e38d8b3fcd8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The primary URL, 'https://dafemum.ru/strik?utm_term=cuanto+es+11+x+14+pulgadas+en+centimetros', is flagged as malicious. The document body, though heavily obfuscated, contains text related to unit conversion, likely a lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=cuanto+es+11+x+14+pulgadas+en+centimetros In PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/gunixagaxi.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/kitok.pdfIn PDF document text
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/500596c77bd46.pdfIn PDF document text
    • https://xixotileko.weebly.com/uploads/1/3/4/0/134018517/mejatajikobo.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/misapekinatewi-nekexugolebamal-gajidiki-belamiredud.pdfIn PDF document text
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/lutibero.pdfIn PDF document text
    • https://vunojomilubokub.weebly.com/uploads/1/3/0/7/130775688/bagetew_kisinu.pdfIn PDF document text
    • https://mamafaxugelat.weebly.com/uploads/1/3/0/8/130813750/8f340abbcd.pdfIn PDF document text
    • https://weludabaner.weebly.com/uploads/1/3/4/8/134854782/bibukatupuxotut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f6ae4e-7de0-4c6e-8047-bb550700aa21/ranipukizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1c44bc-937f-4be9-b040-37644db5c51c/how_much_does_the_total_gym_cost_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7306bf3-0b6c-422d-955f-be72465fe7ee/16608812688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615e7b6c-9e2b-43d9-bc14-89ff23064b99/you_are_the_reason_gospel_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd26d82-1d02-4c9e-87e3-e9891477f93e/nawimawinojefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d78cb1f-7860-4bd2-a531-19ac17741207/catia_v5_tutorial_ppt_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143aca20-a2b5-4a94-8249-1e0472271e4b/37102168987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54486ca9-65a7-4b54-814f-7353db2ad3f6/can_a_nicad_battery_be_restored.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610c69cc-5e2c-40d2-b3df-c7973ad234dc/60263476617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd34df8e-a622-4ce7-ba48-4513d8ca1f0c/kesedobemagakizuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26b87f7-8e2a-4f45-b222-419f2b70c25f/dispatches_michael_herr_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce48a2b2-3846-49cf-ae1a-d4aeb73f595b/wugatewubaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1552ced9-df2e-41d8-8d1c-1361b6cb81c8/8799218272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679a0291-3630-4246-a267-1184599cc10d/1447207211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a743632-2fd9-47b1-a96a-53deb63d32ea/87611297045.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E03A 6408 bytes
SHA-256: b71bf7faf3a2ce2315c75c81a6c499eeb463499f5945c9b99d2f9af5b1770855
font_01_sfnt_off0001f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F006 5504 bytes
SHA-256: fdcbb4801098e7bc680109784119f12431d55ee306c94610b6c45b66d129cff3
font_02_sfnt_off000202bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202BD 12644 bytes
SHA-256: edce572ef8c418f713575054b97ae00cadebf8c4b0429528445a6804f3d2c525

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