Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1002e8406765a05…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 12:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4678d12a8ba928d1405c558e67ee3252 SHA-1: 7bd7e25cb05d8ca88ea45faa7fda763bed86a06b SHA-256: c1002e8406765a0597488e075b09761509acc7b874fa469caeb62e4e732cb1d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to classify this as a malicious document.

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://midufefew.ru/strik?utm_term=types+of+os+images PDF link annotation
    • http://lezigovedavide.getenjoyment.net/bissell_powerforce_compact_turbo_2690_belt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fff7857bb0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_60534db83feb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_605b88766f06a.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/d6509f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5ff832b922c03.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/magosupugosisup.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/what_does_direct_materials_price_variance_mean.pdfIn PDF document text
    • http://wusator.mygamesonline.org/lozomutebadepef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_220d90c5fba541a28edfe5625dda009a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezerawe/papepu.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_01d4f76880ac4fa0affe82e577ca0b5b.pdf?index=trueIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_6a738215d024479db7efb0aea1a06ae5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/33402185492.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/hungry_dragon_game_mod_apk.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_56e3be4d253f49f0b37eabdb2eb6e839.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_e9aa2b355d0544568c8feefb2dbf6b61.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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 5144 bytes
SHA-256: d553716cae7eeeb9d915224e7b26ff790671e9ec595fe44d7ac5b97252d72ee2
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 10468 bytes
SHA-256: 9129fb98098b5fa6149b33a3f885a76a7576582da757d0f27da77f2b44cf6074

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