Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faa53f9a97f9eac…

MALICIOUS

PDF

82.7 KB Created: 2021-03-18 05:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cf068b1a1c3c4d10e4ce3ea4342acd0e SHA-1: 943c0071893cbbfcb381ff9804a8a77d85ced170 SHA-256: 3faa53f9a97f9eac870f094a4426e12e74ee70d6973fb248ee939356e31db397
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://jacksth.ru/123?utm_term=axially+loaded+bar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448548/normal_603b3249e7d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487663/normal_5ffaac665a3c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ffb5a4c267dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_5feaf4d035570.pdfIn PDF document text
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/gikigigiravori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_6032868d41c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fdf930c97f74.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/8099bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5ff1dfa846ee2.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/sobodujukuwiviwobale.pdfIn PDF document text
    • https://zuzidoparifiga.weebly.com/uploads/1/3/5/3/135302874/nixevoserikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_60486ef62c015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc93b3153fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_602283206e788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5ff5997f0e788.pdfIn PDF document text
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/1ab4ccb889f1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5feb84e6f0aa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_f36db16df89a4ee59f9b946feabd5696.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_c97a6e5108034b3da934c47ca06dd1d8.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5156 bytes
SHA-256: 3822d3d0017eef317e381c80c0d077ef93a7500abe283b2f278e3208f03c7231
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 12040 bytes
SHA-256: ad0d0ff989b064bfae28a05c126079ae40047824d3994c9f511c8d0e88a58f98
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16128 bytes
SHA-256: a009a5fdbd65f10a8de02b8424e3c7349d1519d3877ce6c79203abcf1535c1db

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