Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ad6735edce84b3…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 14:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 015888518660202b08539564675d91fc SHA-1: ea1560197a0b3a52afddadbcde807714badeae8d SHA-256: c3ad6735edce84b31e4098d724083944bc30669d71b707985a4b599a7f046c50
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://jacksth.ru/strik?utm_term=the+hound+of+the+baskervilles+movie+1983', indicates a potential phishing or malware distribution lure disguised as search results. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external 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://jacksth.ru/strik?utm_term=the+hound+of+the+baskervilles+movie+1983 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496818/normal_600cf57e22995.pdfIn PDF document text
    • http://meetly.space/declaration_of_single_status_template0kqyr.pdfIn PDF document text
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/lomarojitasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_60126639bbb66.pdfIn PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/1486102.pdfIn PDF document text
    • http://ideal-it.fun/exemple_dossier_uc1_cqp_alsptxl8.pdfIn PDF document text
    • http://dimax-matrasy.ru/door_kickers_free_download_pc0uph5.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/8395194.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/ijyeoDW/xivimulewomewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fd2a2eeda110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_6014be45e7d59.pdfIn PDF document text
    • http://snail-case.store/799057628590k7kn.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/SNfggEl/41620315301.pdfIn PDF document text
    • https://fojaruzagix.weebly.com/uploads/1/3/1/3/131379198/86baef2dbb8.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/jbhbtjc/18034923731.pdfIn PDF document text
    • http://remont-pc.website/joe_dispenza_books_breaking_the_habicudlc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5ffd61242ed78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 5924 bytes
SHA-256: 469ea496ab37ba263c72b5777396db43ac8b6a6c72f5c8154c61d7333b740bd5
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10692 bytes
SHA-256: 013becc442b79a76b92677835bf9b2e0d14dfec842c3124643a63c39eaeac183

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