Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f36398bd87e02b…

MALICIOUS

PDF

89.1 KB Created: 2020-11-11 20:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bc3bd4a906c36b9a051ac160a7d032bb SHA-1: afc61161140eb2c2d096303b7197fd4ddf14c6ef SHA-256: 69f36398bd87e02b5997f762648241df8bf9bc41d9d28d6b6108699726a31c9c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure and external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=how+facts+backfire PDF link annotation
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/5554778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5f9ac644adf66.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/9365850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_5f971359c4fca.pdfIn PDF document text
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/xisupo-bijujox-lakutugavozove-tasilaminide.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/gezefaru.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/boxesijasoge-turimigosenifor-mozikejekud.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/9923874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f9a82a1c8cae.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/463f7a1f-0e46-4990-b6b4-02c6f0e87f71/the_blood_will_never_lose_its_power_sheet_music_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d539d100-23c3-4a88-b500-a828a5c79c7f/bagufuno.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012818.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12818 28012 bytes
SHA-256: 7052c747d29c406cf9d13f9e40f0ab45acd148b8e603d43c023bd3b73b6c89e1
font_00_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5100 bytes
SHA-256: c19bcae95d3454c1a835b8fee1bbc01d9c17d9caa7bd6cfcf888e960e6a7115f
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 10812 bytes
SHA-256: 76aaf2f8049e0d158a972a832bdef93ce1f3e2afa717c7e75602512f6df381ce

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