Malicious PDF — malware analysis report

Static analysis result for SHA-256 d741069cc189e259…

MALICIOUS

PDF

63.7 KB Created: 2020-11-25 17:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25ab48a39d25951df2c27eaa4ca8fb22 SHA-1: 7ca9e03c272ae23f7a101a71a4739297831b72c8 SHA-256: d741069cc189e25918b5629eca77bec3cc53f8e935a9b72f2f7e61fd3d03ed6c
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 pointing to S3 buckets and other domains, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. No scripts were extracted, but the presence of numerous links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=mermaid+bathing+suit+with+tail In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_5f8fc1a6f0bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fb5a1d8dbae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_5fa22eb2da566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5fb59d7705370.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/801ac33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_5faba1b4225e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5fae00351ab01.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/wisupukuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_5fbac4266d26c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5fa9e95c34b80.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/xapidajovaji/best_torrent_finder_software.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/fekopupik.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/jusiturinifabonuminudir.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/calendrier_avril_2019__imprimer.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/73031958782.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/north_carolina_math_3_final_exam.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_off0000b220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB220 5248 bytes
SHA-256: 4a12b3b69aeade5eefd46c3edecdd5f65cb6caa49f867cf7da992708b77c75df
font_01_sfnt_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 9452 bytes
SHA-256: ea4284152cba7930ad0ed66e4f721a8e09d09483dfa777e0080dbe221a701ab2
font_02_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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