Malicious PDF — malware analysis report

Static analysis result for SHA-256 13adfffb83d93fe6…

MALICIOUS

PDF

73.7 KB Created: 2021-02-17 06:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 31a971e5f84af0ec55aa54f9b9013dfa SHA-1: cf7b8a97f9c261f63e9535630de8505147664683 SHA-256: 13adfffb83d93fe6306d7b3e7f4450d0df45bd1057ff59a2ddc6b21991a87fc3
206 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs hosted on disposable domains. The document's content, presented as a paint sprayer manual, is a lure to encourage clicks on these malicious links. The presence of a large number of external links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=nova+390+pc+paint+sprayer+manual PDF link annotation
    • https://pezusipadivo.weebly.com/uploads/1/3/2/3/132303316/3258620.pdfIn PDF document text
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/8491049.pdfIn PDF document text
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/6fe6abd317d5cb0.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/vorojeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_6026b3bc5f712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5fd81a42a5d11.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/8783795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_5fd1311c6f812.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/fixexetole.pdfIn PDF document text
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/viropaleriju_zedev_xaxovegud_pujin.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/3d9de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xisefowu/fetosubugamo.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/97070795960.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/annexure_d_for_passport_format.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_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 5672 bytes
SHA-256: c2acd2a0e8dea527042581f756c4a5169b70124d5c8ab86ac7b38848b4666213
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 12156 bytes
SHA-256: 75e2db98a6b6c53ebd55ddfd2ea64756a6f8e7d94a5d988b4b601e41cefbd908

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