Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8fc8001f66d33…

MALICIOUS

PDF

66.1 KB Created: 2020-11-13 18:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 34ba1630f8ef0d427fa245348dad51ae SHA-1: 1a3e15e1837ba0a08365cbae1e8f2e83743cc46d SHA-256: 8ff8fc8001f66d33b6cf8190ebb7df2f1c74a7bda684c75d16a3ed2771eb0f42
244 Risk Score

Malware Insights

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

The PDF document masquerades as an installation manual to trick users into clicking embedded links. Several heuristics indicate the presence of a link farm and redirection to malicious sites, including a critical finding of a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=hunter+fan+installation+manual In PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/wijedopig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_5fabacd41fde3.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f8b1888718d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_5f8fe5eeeb61d.pdfIn PDF document text
    • https://supogukifululeb.weebly.com/uploads/1/3/4/3/134307834/dudozatipilel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_5faea41a5d34b.pdfIn PDF document text
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/98b5b9c54b91af.pdfIn PDF document text
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/xorulipubaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6506316-3768-494d-b3b5-aad29be14710/67279463008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5aafcf-7c28-464d-a6e0-7ccfd32105be/suvok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00febf2e-b8a2-4967-bed1-fb7295693d2a/sonic_episode_2_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/epic_of_eden_isaiah_study_guide.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 4876 bytes
SHA-256: 1b717372f20c97abf1e4f8ee7994a30126fc6694c759a6eb07734f5e95463be5
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 9916 bytes
SHA-256: efb453be0c8e2bb76ab01b1b777ea3dd8fea567cd09636100ce8b2e4aaf90df3

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