Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e1d7d018246110…

MALICIOUS

PDF

66.5 KB Created: 2020-12-15 02:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 354ac15800360227d1bf04505e232375 SHA-1: e7b1fefe66a850baa878a77f3141e9adcbfc8aaa SHA-256: c6e1d7d01824611036ecd062a2c6d422513f82d92648c53e3c85e4b28a5976df
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to obscure the final destination and potentially engage in SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=french+alpine+river+use In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_5fb86e3104604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5fa99b5151134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5fb520167ffa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f897895b22ad.pdfIn PDF document text
    • https://vezidinudavad.weebly.com/uploads/1/3/4/4/134481570/5e3e7a7723d161.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/gisotora_rikuwe_dofetobowidoki_wejokepusep.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/54a17721-c4dc-4b3b-bc73-187461ab3887/48546649066.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07d836b97992eb55a0df7/t/5fc2f1993c02f22b9d6e648b/1606611353344/health_insurance_today_chapter_8_workbook_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe20fe64571256540336aa/1606295813108/46283300506.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50bdd239b0722914be43a/t/5fd6fd6cb1c3f31c7a97fb23/1607925103036/laparoscopy_in_pregnancy_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68dcde9fc3622d549048f/t/5fcc43d1978da30c56f18b59/1607222228208/deadline_to_vote_for_presidential_election_2020.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_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 5036 bytes
SHA-256: 72633cd08efc88a5de29a4cc57224667f9978f28ea59854eb4af1699bc800a0d
font_01_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 10780 bytes
SHA-256: 284ed4edbb9a0f8baf200098b88645b02a92efca34e7aeb33796321bc39525fb

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