Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa11c6d3909f91ff…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 13:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cb83b43077637a1bcdf7ee8da3255b52 SHA-1: 9e965b79402692572dc3f22492e2092a9aa078a0 SHA-256: fa11c6d3909f91ff1c0caf384d3d21c1a89cd76cc1f773d19692e3789bc3217c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://druttle.ru/123?utm_term=boyce+avenue+cover+sessions+volume+2 PDF link annotation
    • http://grantmedica.ru/96158736233jjdlz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444646/normal_5fde811075c75.pdfIn PDF document text
    • https://budemarapi.weebly.com/uploads/1/3/1/3/131381681/4005987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_60382ee84ef8a.pdfIn PDF document text
    • http://sesopuligu.iblogger.org/alejandro_casona_obras.pdfIn PDF document text
    • http://trokot-tonirovka.online/edward_taylor_the_preface_analysised5p9.pdfIn PDF document text
    • http://sizupefujexebov.22web.org/hp_5520_ink_argos.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/durunitug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_6046320a4537e.pdfIn PDF document text
    • http://amandeepsadyora.com/kagugasekad482d.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/vukusa/video_dari_dailymotion_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/59967943832.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/gems_affidavit_d_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/what_is_the_point_of_welcome_to_night_vale.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/define_total_quality_management_in_healthcare.pdfIn PDF document text
    • http://xomogovi.epizy.com/10119150837.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/cheapest_spay_and_neuter_near_me.pdfIn PDF document text
    • http://vefapiba.epizy.com/impressart_stamp_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/acog_diabetes_in_pregnancy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/mugeken.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_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 5288 bytes
SHA-256: 81fb07ef06e2a1748f85b08d8c0a296aebb6968c63c3821b4216d3b254636e14
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10656 bytes
SHA-256: 949f15b533f6d4ecd36b0e3788068ce2d804d0fa9734c1715ebf182e765a7c2c

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