Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b81b0839899040c…

MALICIOUS

PDF

81.9 KB Created: 2021-05-21 11:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 60ba1ce0ed75b678af3aa5ccb297076c SHA-1: d3923178fd87b4b71342613ce9a01816f24e11c0 SHA-256: 8b81b0839899040cdcc69826be213664ec91e668b4dbb922e6694f49ac85385c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://leonvi.ru/strik?utm_term=barbara+minto+pyramid+principle+pdf PDF link annotation
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/xikepuladerus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_602c100b3385b.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/7398143.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/rakotado.pdfIn PDF document text
    • https://gexoronigiz.weebly.com/uploads/1/3/4/2/134265935/belagetubunawuwuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6066a1a8af70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_602c51e2e428c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_60669898ce853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_602e5b7517da6.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/2431297.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/pepan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_602a08790c9a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_600a9db7eb0ad.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/4424279.pdfIn PDF document text
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/xuzirugafepa_wolelomu_joviw_raromuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_606e3cc00c220.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/difigomisosak/duvekelabotituw.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/684616052.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/how_to_fix_kenmore_washer_door_lock.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/little_mix_touch_acoustic_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/what_are_birds_trying_to_tell_us.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/best_books_on_psychology_and_human_behavior.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/69761121363.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/wefetegexoronobajikemi.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/newozowowigu.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_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 5416 bytes
SHA-256: 669b174f75cc07078f56c6ed766ba5fc60ea0dda8102874e07587b8516ef51e2
font_01_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 11564 bytes
SHA-256: 00d90e4eeda23880c66a695f013343aaee2701a442b190d6007d75b41a06fac6

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