Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a1a834f825a34b…

MALICIOUS

PDF

70.1 KB Created: 2021-06-11 00:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0fa4722452f142577503cf2d49eb8eb7 SHA-1: f815bed18f0d10ab286ccfd72dde5b5d5fa952cd SHA-256: 35a1a834f825a34b95f84d2904cab18aa83abbd92e4afa49e17bdc70fdd071d5
186 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 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://pistant.ru/pbw?utm_term=malayalam+kambi+katha+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5ff1ee535f1c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446264/normal_5fc70e115a93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_5fd6708425344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_60c0ff94846a8.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/9c0845c124.pdfIn PDF document text
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/5662146.pdfIn PDF document text
    • https://wutusubefesuw.weebly.com/uploads/1/3/5/9/135961291/309021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fda12a6315fd.pdfIn PDF document text
    • https://pozojemiveze.weebly.com/uploads/1/3/4/6/134690114/guduzukedegiso.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/jupap_dolexojimijoso_gugawogudijuwig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_601b03bd6a8c3.pdfIn PDF document text
    • https://pelofaneb.weebly.com/uploads/1/3/4/2/134235527/puvilulasexibenoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6056e06bc1c93.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/a4be2647b7a97.pdfIn PDF document text
    • https://lemoxubasox.weebly.com/uploads/1/3/4/3/134329143/gupimuwupululun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_6032fd351917f.pdfIn PDF document text
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/bedakebisov_tijumidive_vasafibun_vomeriba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05edf01d-8e98-4083-bedd-f6bf07468d11/download_game_captain_tsubasa_ps2_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568033a1-c006-4f5a-a3a9-fbff25019302/notomugaminow.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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 5408 bytes
SHA-256: eb6ee0a342a0efb5bc6f5c471242eca4cb418d6380829fcbea3793077e6c267c
font_01_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 11148 bytes
SHA-256: cc57a5597b908b24515d413776b3bfd527ebb292b59c378d8b465c11e3b9f641

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