Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f5cf2873db2077…

MALICIOUS

PDF

73.8 KB Created: 2021-04-06 05:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0827e98b1e931686501cbff15bf83dfb SHA-1: 2c4bf7849846da6ba8e48ada4abe5a5cd2dfcbf7 SHA-256: 76f5cf2873db2077ccb5d338de18661d0293832bccab4afb552d0072ab01e72e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://seumenha.ru/strik?utm_term=questions+to+ask+married+couples+about+their+relationship', suggests a phishing or scam attempt disguised as relevant content. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=questions+to+ask+married+couples+about+their+relationship PDF link annotation
    • http://obzorov.site/is_null_or_empty_crystal_reportssfc30.pdfIn PDF document text
    • http://aduo5.online/504672007082br3w.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/7885673.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/9666178.pdfIn PDF document text
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/603f9e718c5ae.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/benim_hocam_tarih_test.pdfIn PDF document text
    • https://rexanofodifedow.weebly.com/uploads/1/3/1/3/131378899/446761.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/6306934.pdfIn PDF document text
    • https://tawisowa.weebly.com/uploads/1/3/5/3/135315305/8928735.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/1003226.pdfIn PDF document text
    • http://citimart.online/mr_love_queen_s_choice_lucien_karmax4zi0.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/bajaj_dominar_400_specification.pdfIn PDF document text
    • http://menformula.xyz/57758719075pmp2u.pdfIn PDF document text
    • https://zajadibagaku.weebly.com/uploads/1/3/5/3/135341716/116089eed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wunojipu/play_store_app_stuck_on_pending.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/alphabetize_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/texas_law_parallel_parking.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/setikerugotizezidiseg.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/siximitolimogoza.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_46020f74789a4deeb4235ef752e18d86.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_ecc380f801b84196abcca0e28d0dcd10.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_9125fa6a4a0741b98ef92b167288f5fe.pdf?index=trueIn PDF document text
    • http://refusunono.onlinewebshop.net/89918687670.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 5576 bytes
SHA-256: e35f7b77bffb3fdda87c7162e18929b27bb408955823e2bc8ee5cd54a9ec9564
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10404 bytes
SHA-256: 15e62894ac6ef6d1acaeb49eac15f20fb27adf543378d452606a4cb1a4187f25

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