Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4d505822cfc1d0…

MALICIOUS

PDF

84.0 KB Created: 2021-02-26 07:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 352eddafcb373a8c1e672efd780f2f91 SHA-1: ad7051311b3dfa564b7ff4eeefeb1edee6c22144 SHA-256: 1d4d505822cfc1d0f8538ba2a4b85c52823390f05b69c243cd2971b738fbc78a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to redirect users to compromised or malicious sites.

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://maypoin.ru/123?utm_term=stihl+cordless+weed+eater+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474445/normal_600f3f0aba528.pdfIn PDF document text
    • https://cdn.sqhk.co/butofelo/GmjefML/air_traffic_controller_school_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jcyicz1/zinepanamozogilux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600badbc29e5d.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/jjjcgc7/xesewanalevoribiwavalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_6000a4e6d1edd.pdfIn PDF document text
    • https://vidolatukala.weebly.com/uploads/1/3/5/3/135316506/5465395.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hddjj6x/men_s_table_tennis_scores_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6035854e8eb50.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/1578be124.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/bStPHia/pathogenesis_of_atherosclerosis_amboss.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/46930622133.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/1af487ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajofot.epizy.com/73214062351.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/46249483810.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/please_sign_the_attached_form_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/35306583285.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_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 5356 bytes
SHA-256: 3bf83d25e4c6701aa57b5594cd570bfc068bcb00bee3f35444d45723f47abd40
font_01_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 10744 bytes
SHA-256: 13b0fa5e388ef73e26733207921d3a9f812f8d1d20483982c3daf6cee2276c29

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