Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a708e0d08da760…

MALICIOUS

PDF

121.5 KB Created: 2021-03-14 23:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 76ad29319f7204ef4f151bbaf4d101db SHA-1: 5a23c170776fe92ffae9dff48da1db7f5d0f304b SHA-256: c6a708e0d08da76062ab2ec4c029c36868c8cadb0761d3a9fc533c2c45af20ed
186 Risk Score

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 0.9997

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://botokaw.ru/123?utm_term=calendario+atp+2018+pdf PDF link annotation
    • https://cdn.sqhk.co/zumiredosuwi/hQjaijo/21973368204.pdfIn PDF document text
    • http://tipografiyav.moscow/volexuzafajovidezoguliievcg.pdfIn PDF document text
    • http://rentline.pro/north_african_originnrzhl.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/iinjcge/34689085275.pdfIn PDF document text
    • http://sanikeroror.iblogger.org/xesatigoxixelinuvomikazaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/34hfLia/kubra_ez-_pay_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/hihwE5y/67572623351.pdfIn PDF document text
    • http://foyou.store/magpul_ar_15_handguard_rail4l2gd.pdfIn PDF document text
    • http://sukujemegamog.22web.org/charles_aznavour_for_me_formidable.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
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_676f032c8d52432daad3c97f605bcbca.pdf?index=trueIn PDF document text
    • http://janarisugikev.rf.gd/aldi_gardenline_electric_chainsaw_manual.pdfIn PDF document text
    • http://duwufinojitu.rf.gd/33411606005.pdfIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_31444bc7bb0d452cbf3342fa5979c037.pdf?index=trueIn 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_off00018934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18934 5188 bytes
SHA-256: 4173f0e8085e3f078740317f5c806af9179f85e89a73edd91ddb0ada3f4b2c4c
font_01_sfnt_off00019aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AEC 16636 bytes
SHA-256: 64b3aee71ec353ced94da50a8dcfe593434c79cd2efa3da34f4f2e19c5aa297e
font_02_sfnt_off0001ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA74 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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