Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e1da1a75c532c4…

MALICIOUS

PDF

62.5 KB Created: 2020-11-20 13:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 51313f65285ec19692f2fdfeadbeb1fa SHA-1: dc21af38d8f29e545bf7439a3f5d52ae6cf6a467 SHA-256: 85e1da1a75c532c40ba5c8db3559ce34fcb74f1ba180f4c2a1c7c78563da94c4
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://traffnew.ru/123?utm_term=trak-4+12v+gps+tracker PDF link annotation
    • https://kutozeworefo.weebly.com/uploads/1/3/4/3/134306688/lawufugusaluwis-dawur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_5fa50256dbd96.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/pumakerod_boziridusuzob.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/vexeliku/types_of_anemia_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/98720254736.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/assessment_methods_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/piecewise_functions_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/cute_girl_wallpaper_hd_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/30861767648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fcd68a-738f-43fa-aa55-09ea1831bec0/art_a_brief_history_6th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/hinchingbrooke_hospital_cqc_report_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74f5214-5537-4290-80bb-5f69e97673fd/sybil_schreiber_book.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/33440900742.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/plasmodium_life_cycle_in_hindi.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_off0000b45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45C 5448 bytes
SHA-256: e61c3fcf3d630d93422d0af83e6265bc8b2b98e176e565f949c0fb3543c01632
font_01_sfnt_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 10880 bytes
SHA-256: 4ebb2bb465488f242930333501887afa040774c71da30dedb853fc8235c16876

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