Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8d5b8e858cc972…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 21:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe673b9a01fe35030d1e5c900cd0d83c SHA-1: 122c81a8a685239279f8cbdefb29a7cc8c1d0104 SHA-256: 9d8d5b8e858cc972d2468313ccd9115dafc9192a3d8655de54d68baddb2fb0ad
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=n+t+r+old+songs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fe567578740c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5fe42255cbbe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6057a3813a6b4.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/veperiwoluwomilud.pdfIn PDF document text
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/9304846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_600ff5a73de61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60170e11cffa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_60233281d108d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_601d741a5a95b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5fe10f8081c74.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/11433652728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_605d6a7c06734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_5fe9d5677b6ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_600bbfe780131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_606a79a33dce4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5fdf25bd0baf1.pdfIn PDF document text
    • https://bumibosawo.weebly.com/uploads/1/3/4/3/134374517/lukupe_remufan_jelug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_60207a619cbd7.pdfIn PDF document text
    • https://tomewulasanuful.weebly.com/uploads/1/3/1/6/131637374/gomowatit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417406/normal_600395fc8e076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fe267f0b2b14.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/cantos_populares_para_difuntos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilosokanik.myartsonline.com/35668123063.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_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 4752 bytes
SHA-256: 766e9c967aca544078d041aadb8fa4f83001f27891b2577b0dbd9ec1a99aca3e
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 11996 bytes
SHA-256: baf870789b3a45e7747b6c04a1c7739a299b81df59342e240d9a784acfc7a2b4

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