Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45a40a04a3de149…

MALICIOUS

PDF

66.2 KB Created: 2020-12-24 16:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d4feee90c4ff8be1e2cc02570d8a7daa SHA-1: 9caa122393bb59461a7f844134a79f318da65908 SHA-256: c45a40a04a3de149fa246f70bdda396e52abb6e52a16a878ca9be374b1682762
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at `https://traffmen.ru/strik?utm_term=colors+of+the+wind+karaoke+instrumental`. The ML classifier and ClamAV also flagged this file as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=colors+of+the+wind+karaoke+instrumental In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fb58d0a8ec1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fddffa641519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8c4b698beae.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/4a1cf667bae78f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371783/normal_5fe3eaad5111a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fd9bc352564e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8d50d2846d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jufowokedunod/business_information_systems_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd9cf09-3d0c-4332-8387-c38f186b6f00/how_to_put_eit_certification_on_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/13728455065.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/east_west_play_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BC 5208 bytes
SHA-256: dd052f2e729b4216b44627578ee6154ead03d8cb68cd8e5aedf3ffa1d23135d8
font_01_sfnt_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 10396 bytes
SHA-256: 0c5e942d775a61dadac74641e86fa2f053b3edc2d586be911956258f50b031ae
font_02_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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