Malicious PDF — malware analysis report

Static analysis result for SHA-256 db96bb179b0bf231…

MALICIOUS

PDF

79.6 KB Created: 2021-02-22 09:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 567c71114fbd45e941171506068fa620 SHA-1: a4f1300525f32faa22f8be45b07760b6578d6d02 SHA-256: db96bb179b0bf23131b2b39d63d0801bf61cfbb6c1ded207644de317279440fa
246 Risk Score

Malware Insights

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

The file is identified as a phishing lure impersonating Facebook, directing users to a malicious redirector URL. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the final phishing destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/tomij_wanafawonavez_xizujarikoke.pdf.
  • 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://leonvi.ru/wix?keyword=personal+math+trainer+geometry+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5ff266ae0de13.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/tomij_wanafawonavez_xizujarikoke.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/56015266707wwlkx.pdfIn PDF document text
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/4761946.pdfIn PDF document text
    • http://mikrotikwizard.com/fajixogaasqou.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420776/normal_5ff4ee78f2441.pdfIn PDF document text
    • https://rukawaxosudeda.weebly.com/uploads/1/3/4/3/134308265/borijusepamim_xolivotevawud_mopokenafijefig.pdfIn PDF document text
    • https://teviwodujote.weebly.com/uploads/1/3/1/4/131453741/sedipadejiraza.pdfIn PDF document text
    • https://basapozixuw.weebly.com/uploads/1/3/4/7/134701575/nodewubemebivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fe0200df2546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_60183dbadda26.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/zazim-nujifa.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/wowetusibal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff4b65b4f396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_6011d44e4fde4.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/die_kleine_raupe_nimmersatt_geschichte_lesenr5tmu.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/tanosaz.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/gazivemon/80622132016.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/48889473439.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/hadrian_s_wall_guided_walking_holiday.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/spanish_reading_comprehension_worksheets.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_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 5292 bytes
SHA-256: 2f136899df2554310b227aaada0aac5b1d1e1aca7942ec84de65b43200627f0b
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 10476 bytes
SHA-256: 5594f4372395137ad12c17c5d69107781614e67401fc08f7d005903c26b7e784