Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f31be142619ff0c…

MALICIOUS

PDF

83.5 KB Created: 2021-04-08 06:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8f4764dd8f8164fe08f04a83e399c501 SHA-1: 8ac35cea48fc0ecd3a50b3d59431f33055aa3fda SHA-256: 3f31be142619ff0ce57bed1780261654611d26400542bc98c899d1d7ee5567a0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to reference an application form, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/123?utm_term=aligarh+muslim+university+application+form+2018 PDF link annotation
    • http://sunufosabupes.scienceontheweb.net/85504885051.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/70726807638.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/hyperbole_and_a_half_portugues.pdfIn PDF document text
    • http://reassurez-moi-fr.info/nedup0w9mp.pdfIn PDF document text
    • http://creditinquiry.info/psychoanalytic_criticism_in_literatureplv4t.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/77248317174.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/abrsm_piano_grade_1_pieces.pdfIn PDF document text
    • http://bitsracing.net/riwaporwwnfc.pdfIn PDF document text
    • http://pribor-poverka.site/woramikoj66gun.pdfIn PDF document text
    • http://presalle.xyz/22509853651uwte4.pdfIn PDF document text
    • http://effektzhizni.ru/57509054578v7e7c.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/guvapenerivebokuton.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/aikido_aikikai_techniques.pdfIn PDF document text
    • http://netlysy.online/51362891250vmox6.pdfIn PDF document text
    • http://voirly.xyz/setununirovumic21kl.pdfIn PDF document text
    • http://teksalle.xyz/318747092459bf26.pdfIn PDF document text
    • http://persequenteamsohbet.com/how_to_memorize_tarotii3uq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zaxuzut.atwebpages.com/articulos_cientificos_de_quimica_analitica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77b8368-8f7a-4d4b-a10a-e1ac038b6d95/37827170543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16765409-de27-4807-b111-cc77b437637f/70913178239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78f53f9-0755-4293-8867-a6f80083b1bd/61878831485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135cf31c-fee4-40c9-b7fe-43e14d3fa15f/what_is_the_highest_paying_state_for_social_workers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d32b8f-18a4-4335-9de4-d47650d56a36/gewoxojap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 5980 bytes
SHA-256: 7a23e669eb7c51a3d3889712869c9fd261b4f14f1196a5dc856435a9c98d70f2
font_01_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 11324 bytes
SHA-256: 4919db694967b20cae2314ccd41a9be86008a2db05af248537dc5ae1301ae0c0
font_02_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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