Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d1635b16357a1d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 02:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b81390456b2582d739d1dde5d71222bf SHA-1: e0eeb4a1e26b0b9069bc9c042f052da4680cfeb1 SHA-256: 94d1635b16357a1dde9bb84c75dad990dd8e2049ddddd875fed1726864a13d1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/wix?keyword=gold+ppsspp+apk PDF link annotation
    • https://cdn.sqhk.co/mowanideju/DXjciat/dutulilutosagusokuwomef.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/lavireruwi.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/ckjbSHP/53463402297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_60120b9cdf670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_6015c6eb7415d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5fe99447e4fdb.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/geid8oP/fozezemetafako.pdfIn PDF document text
    • http://davavemoj.66ghz.com/47292424993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fd1c86372c53.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/ichjNjc/jozapolis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418379/normal_5ffc2b2c41178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonizevugopu.rf.gd/norton_power_eraser_free.pdfIn PDF document text
    • http://riwexakax.epizy.com/bomatabume.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/bsc_magazine_october_2019.pdfIn PDF document text
    • http://lesodabat.epizy.com/10309930097.pdfIn PDF document text
    • http://beruraxawiloga.rf.gd/71714785484.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/gerrymandering_game_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/que_es_psicologa.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/sincerely_letter_form.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 4952 bytes
SHA-256: c5c3a459efed2ab1ad2f775edc6700612bbe9459ca8d702e211729fb9af39217
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 10736 bytes
SHA-256: 9a838a1554097036d6fa470093bc8a042454b920bfabeb934b84200acfaecc6b