Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee23ada398948d7…

MALICIOUS

PDF

69.4 KB Created: 2021-01-09 23:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6f00bef7f620de163f43c5148242a6fc SHA-1: ebf479334acc0b125437261acf715c846beed8c7 SHA-256: bee23ada398948d7c42a7af30b9ce1040feab4ee2754cccda5120d89f6c625cd
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, identified as a link farm, with several pointing to known malicious redirectors. ClamAV and ML classifiers also flagged this document as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=john+a+dreams+origin In PDF document text
    • https://cdn.sqhk.co/gemadaruvow/Hllgjhh/tikixabigul.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/QhiXhdg/bike_stunt_2020_free_motorcycle_game_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5ff1dcd461ee5.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/Cibifhb/jadenimipepolepol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5fbc251175ec4.pdfIn PDF document text
    • https://jovavogi.weebly.com/uploads/1/3/4/5/134597399/145c3b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5fe46f0d96be7.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/xanunafojuloki/bloodborne_ps4_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/nugef.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/konar_tamil_guide_9th_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/hundreds_tens_and_ones_worksheet.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 5196 bytes
SHA-256: 137b858f4bb85ef2dc9aad3b4ce56388d4807088f3623d9b5ab69d5ae45a6710
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10228 bytes
SHA-256: f61fe63d22cd9dd4569d24ed6e80a38b1b2aa3ba1c6039913906ccdc71446f40

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