Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f2d9def21f83f4…

MALICIOUS

PDF

84.9 KB Created: 2021-01-21 10:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b61663d1289d8e9fa73f6e407cf65db1 SHA-1: 894bc0f0e348b0a6842c06d585d0d0047104dc10 SHA-256: 87f2d9def21f83f4ba14db4f61508bac3dd250e19c5738be8db717fdd4c3895e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=creutzfeldt+jakob+disease+case+report PDF link annotation
    • https://cdn.sqhk.co/sizozizaj/gR2gdjh/moksha_bellevue_yelp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5fdb772ae216a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369914/normal_5ff808c3cfd8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5ffef82a30502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fc89e0bc6bcc.pdfIn PDF document text
    • https://cdn.sqhk.co/gopepilexafi/jLhghdQ/bingo_and_rolly_halloween_costume_baby.pdfIn PDF document text
    • https://site-1173509.mozfiles.com/files/1173509/bunny_run_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5ff97d9506843.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/1710268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5ffc9f3828109.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/ajjAjbc/pulse_points_on_female_body.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5fe42648a993b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425506/normal_5fdc810e23cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f9961c8a0d4d.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hghY4i9/arcade_shooting_games_on_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f970c7af263a.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://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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 5280 bytes
SHA-256: 9d7837e816655200e62a797249be3328a8b6735314a7a8c69274973d88f2d255
font_01_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 12136 bytes
SHA-256: 4732d59937f8bb64f43aa337311804d00e4b4c106d33c19e6b20b9ea70e35423
font_02_sfnt_off00013829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13829 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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