Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a1b0908deda0f2…

MALICIOUS

PDF

83.2 KB Created: 2020-11-25 20:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31f03dab49bccff1f5b1bef8cdbc1aa6 SHA-1: 90f36ee4892cc3ad363351d702c487a81b00c4ad SHA-256: 92a1b0908deda0f24b5502124ca4a4277b837fae51419f706b61ccdde0b8e22d
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://traffking.ru/strik?utm_term=music+composition+rubric PDF link annotation
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/pomizapitugelesotamu.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/xasudijenajafemulol.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/1239403.pdfIn PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/sorojesuta-wavozaziwimona-nojuw-pisunabubezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fb965257252e.pdfIn PDF document text
    • https://nadaxobolimige.weebly.com/uploads/1/3/4/3/134365666/7734338.pdfIn PDF document text
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/lapexajafufanew-gezisevit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_5fa745bf93822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5fad8285b0de5.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/fujadabez/88222349375.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/jalofivovufola.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/biosphere_reserves_in_india_map.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/figulidurumagofutukosose.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_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 4984 bytes
SHA-256: a5f3a37cc95a262e7e191636144577742a4ca315628c2621a15e38b56ac566c7
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 11100 bytes
SHA-256: 5c3a900d49f04388cea30399ddbdaec3fc39c2e999576cbeec20b9c65ef83647

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