Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fd4deeea71a52b…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 17:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b628753fcea503fa64f49206d606812f SHA-1: 94a9c3ea53cb80fa176eebcd4a11823673f57e4b SHA-256: 73fd4deeea71a52bd410c260257fa93a11952869138dfdf6cea8b7d76908ce0b
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://maypoin.ru/wix?keyword=elemental+resistance+spell+5e PDF link annotation
    • http://fepemewavitik.66ghz.com/nafenoxel.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/bic4gjE/super_ninja_boy_gamefaqs.pdfIn PDF document text
    • http://megatorg.ru/crazy_climber_arcade_cabinetdbgh7.pdfIn PDF document text
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/gokanibexuwutikowu.pdfIn PDF document text
    • http://eglo.club/200467545467gh3s.pdfIn PDF document text
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/vazabumowup-nejimenos.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/Tif2ibj/woxixukav.pdfIn PDF document text
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/a4e357298.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/hdgdhfS/81439139136.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/tumozuja_gofodam_dukibapi_zonirabibof.pdfIn PDF document text
    • https://pegutezupo.weebly.com/uploads/1/3/2/7/132740329/6059631358344.pdfIn PDF document text
    • http://fruits-summer.fun/17282995590fg04w.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
    • http://xumidexasij.epizy.com/setaxuwasavezuf.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/fezunitekom.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/bein_sports_guide_usa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 4836 bytes
SHA-256: 88badee90c99221c16df0ac5ec1f238d08625875ce98a61254ca93d382610425
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 10548 bytes
SHA-256: f30e2d9787acf1b22412cd0d79562031f19582f2b57e9a2f6a509c2e63c1bf52
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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