Malicious PDF — malware analysis report

Static analysis result for SHA-256 447f4e1455c25771…

MALICIOUS

PDF

82.0 KB Created: 2021-02-12 07:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8bc558609eba1e9605adf7128cb533d9 SHA-1: c1542af10344420912d04e70c907aef030a8fb0b SHA-256: 447f4e1455c257711783c4400f09d964d975daa67d2c1f467264f0ebe7a54181
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=get+the+guy+book+pdf PDF link annotation
    • https://kujufilobi.weebly.com/uploads/1/3/1/4/131482850/xukexidibijolu-biwere-vixenir.pdfIn PDF document text
    • http://appletopshop.ru/52861783950z1pef.pdfIn PDF document text
    • http://indir-kazan.com/vadimipelapif7qvl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_60074e65069c6.pdfIn PDF document text
    • http://simcars.ru/come_aggiungere_stickers_su_whatsapph8p53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600ecd3e7b2c4.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/wulikesurovoredegodw1btd.pdfIn PDF document text
    • http://jukofokunazevam.iblogger.org/judicial_california_voter_guide.pdfIn PDF document text
    • https://gabonavokelog.weebly.com/uploads/1/3/4/6/134684269/panalopofegis.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://kanisal.epizy.com/werow.pdfIn PDF document text
    • http://fokobawenola.epizy.com/55760397991.pdfIn PDF document text
    • http://pasivete.epizy.com/74126998254.pdfIn PDF document text
    • http://jusaxokipumata.rf.gd/bulletin_de_paie_explication.pdfIn PDF document text
    • http://wakerot.epizy.com/html5_css_template_basic.pdfIn PDF document text
    • http://voxowifogiwoxa.rf.gd/wuxasizegowe.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_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 4852 bytes
SHA-256: 74159bbcc69c456c8dbea9b5366a4be8c72f3d0c18609bbf5c5828a47795a369
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10920 bytes
SHA-256: 91497a6af5d06b5009e0416a7b9c6ad065241c0804c9660a56837ec3ea7eb033
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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