Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a42bb468c4763f…

MALICIOUS

PDF

95.7 KB Created: 2021-03-02 00:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7be5f3cf4df15fb2023fa756114ac31 SHA-1: 85d209891ada0a721df841a5badd9306427e8651 SHA-256: d5a42bb468c4763f3d5e4ecba330e56938b7bc4124aec5c648e7542008336eb6
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_MFA_LURE' indicates the document's content is likely a phishing lure, attempting to harvest credentials or session tokens. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential theft or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nipisod.ru/strik?utm_term=learn+matlab+coding+online PDF link annotation
    • https://cdn.sqhk.co/puwipaneke/ZggrhB2/dragon_quest_viii_3ds_review.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/c1jahiW/96635292272.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/9161509.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/5143028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5ff193030a342.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/surujoterekasaz-wolareridoru.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/9770111.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/jumexani.pdfIn PDF document text
    • https://wisokovunali.weebly.com/uploads/1/3/6/0/136051549/fimati.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/5625414.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/04b35a953ef0.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/d5b54.pdfIn PDF document text
    • https://mekaxojukana.weebly.com/uploads/1/3/1/3/131379168/85e79390d1c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifojizu.myartsonline.com/2011_mini_cooper_countryman_s_oil_reset.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_off00013aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 5164 bytes
SHA-256: fdb61184ede2f77804de9d6cd0d0f059ba15e11084c806e286b8d928d72a28d4
font_01_sfnt_off00014c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C74 11068 bytes
SHA-256: b3eea1c23c4fafee5f20eef947afce6d8a36eb773f4b36a7b9ffad2c93668950

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