Malicious PDF — malware analysis report

Static analysis result for SHA-256 4195a980ce70127b…

MALICIOUS

PDF

68.5 KB Created: 2020-11-13 08:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ccd6735ef73c1489579add732a32525e SHA-1: 8ae6a1684c4125d02b67eac39fff75af97c6dd49 SHA-256: 4195a980ce70127bbb47a82cffff96bca31cd222a1b5cf309049049b1e166b89
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external websites, with at least one identified as a known malicious redirector. The heuristic firings indicate a malicious redirector link and a link farm, suggesting the document's primary purpose is to direct users to potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/aws?utm_term=buerger+disease+pdf+indonesia In PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/3001531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5f9da6f528de3.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/zezasajikuwew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fa092ebd587a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f87a91ab34d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fa295a854ada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/pensum_de_arquitectura_uasd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4e2f94-15d5-4252-92d5-96eddf713844/subliminal_messages_in_songs_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade99d76-c285-48ba-95c3-aa895df02d3f/90600272093.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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 5224 bytes
SHA-256: 7743a01d7b31174ddedfa03870dc576f2b79c642191ba49ab4f9020b1a795825
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 11796 bytes
SHA-256: cddc276d97632646e7bd6ca14ff0102e66f54cb4cb6bdc31eb45afdeb61dc6ad

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