Malicious PDF — malware analysis report

Static analysis result for SHA-256 834d2ccbc83b33a5…

MALICIOUS

PDF

84.2 KB Created: 2021-03-22 02:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 034d858da75dc3706336d4bc6e4d45aa SHA-1: 9cdc9d4187a64a85b65a11389491ab716362b84a SHA-256: 834d2ccbc83b33a53d397b6b92059f9a433ca44e3ea14a7acac449d4093a3dbd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to drive traffic or distribute further malware. The embedded URLs and the document's structure point towards a phishing or SEO spam campaign.

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://mezovuduw.ru/123?utm_term=general+electric+financial+report+2019 PDF link annotation
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/torovosuzerovom-lakufibo-kedomokipalitu-balutar.pdfIn PDF document text
    • https://xubupatulebo.weebly.com/uploads/1/3/4/7/134701573/sanokozuxixuse-vusokiretotizif-jalekifu.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/zujetelitokokisunedip.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/b5728c4d61.pdfIn PDF document text
    • http://lorenbayi.com/25544363462z0j9i.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/rajunexafu-fevetegan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_5fdc1f3524d1e.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/jimuxogebabawokes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_60412d09df2b1.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/7696982.pdfIn PDF document text
    • http://optalpha.com/342665055538uxve.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/25b31f93ff36a.pdfIn PDF document text
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/6630302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_d2fc61cba8044a24b6496a000833609c.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_9d8159c4f0864304a8e4043329f3ad7b.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_ec21e4aea5904cbb913ad3cc2861734a.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_2b8a9c1248e7476ead7fe5885ece36aa.pdf?index=trueIn PDF document text
    • http://wudazebej.atwebpages.com/aerobic_and_anaerobic_respiration_notes.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_0dd699f3194c47e8b99d4a52e21fab08.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 5344 bytes
SHA-256: 96cbfddca47525fd3d7acf69b323ad0e7176f7c8f262930abcd471708f34f91b
font_01_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 10816 bytes
SHA-256: 18eaf6374455a48e2f8504c13136d10a2d6d7489e9dcd5f19467c34c0da696ba

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