Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f6bb838f452f97…

MALICIOUS

PDF

103.1 KB Created: 2021-02-24 19:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e398ba7e5e2fba67f80f64f25d62c9c8 SHA-1: d852230c0926bb795064d64d6afc3353752b6e07 SHA-256: 71f6bb838f452f977e86278ab5f65df903fa0bcb631a4b4310a5dda20ef0f083
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains and Weebly/sqhk.co hosting, suggesting a link farm for SEO manipulation or to distribute further malware. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=how+many+watts+are+kicker+cvr+12 PDF link annotation
    • https://mopelajizefuxo.weebly.com/uploads/1/3/0/7/130739073/a014365cda4ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fe9ccfa961c6.pdfIn PDF document text
    • http://paselon.getenjoyment.net/how_do_i_remove_demo_mode_sony_bravia.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/gdIjj30/red_heart_loop_yarn_baby_blanket.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/dMhdfOb/piano_band_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/gfGjgII/47310143064.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/iHdDijC/best_streetball_dunkers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_602460817e8e2.pdfIn PDF document text
    • http://alania365.ru/dobuwogaopq.pdfIn PDF document text
    • http://desokore.medianewsonline.com/30328413146.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/0fcc14fef8a5f.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/gcaggia/73947439286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fcb4979ca33f.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/Bhahhif/89712117976.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/towezofetafikun.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/jjLsa5Z/best_settlement_defense_fallout_4.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/fitafaxi.pdfIn PDF document text
    • http://neojust.ru/34427528894ctm0j.pdfIn PDF document text
    • https://rurefisofe.weebly.com/uploads/1/3/5/3/135325463/mofadukepabe.pdfIn PDF document text
    • http://detonicinitalia.website/deeping_st_james_primary_school_ofsted_report1rkpp.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/zunaxabilubuxajik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/94509761729.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_off00014f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F72 5376 bytes
SHA-256: 7bae44bd91f7e07d8d422c475badc26cb8a352df37436ecd123b66aad44da498
font_01_sfnt_off000161c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C6 13060 bytes
SHA-256: d73cb96d9708286ed98c95f45d502222cb45ce8a71bb7f8e799d1fca75688389