Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55fa85007cb354f…

MALICIOUS

PDF

61.2 KB Created: 2020-11-24 03:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3f67803c0e994b76c129f72ea001d33a SHA-1: 7aa9803523243457519bb758e846b10760c2a572 SHA-256: b55fa85007cb354f8d60b47cc988b3bfe420a548c3e2bbfeb96cbf9d4b068af5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to malicious infrastructure, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an exploitation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/strik?utm_term=foundations+of+microbiology+9th+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5f9a063197b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fa5f926dbf86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f872600527a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f8bac3149de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5fb82fefd3de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fb819bdc5e5a.pdfIn PDF document text
    • https://naxaludegefow.weebly.com/uploads/1/3/4/7/134776308/4c8498eed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5fa7f16f2dbf3.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/5afe974f-1638-48bd-9a0e-84c1b42c1013/65535795763.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/49999060612.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/64349215552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb20cba-b1d6-4566-8d1a-81fbadfbb9f5/vojoribusaraligezegoraloz.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/6720807134.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_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 5788 bytes
SHA-256: 39de0d6baa624938f43b6ceff2c9775c56b194e2784cf1d749bee8e3a4d404ca
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 9604 bytes
SHA-256: d7906a44c82fa89d518a03c6aab497ac74cb358b60b0e6cfc22b1db166a4d25b

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