Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94f0cd2fcc0f75a…

MALICIOUS

PDF

82.1 KB Created: 2020-12-22 22:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 52f149c51c146a84e8985b22e9a0be71 SHA-1: 17092469630bd3174c933a3624afb4e6ca6bb4c9 SHA-256: c94f0cd2fcc0f75a17267cfe09c2f99374617d63d632daf9efe7d4128a440c56
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, 28 of which are external PDF links. The ML classifier and ClamAV also strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://cctraff.ru/strik?utm_term=opensooq+mecca+street+amman In PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/1245837.pdfIn PDF document text
    • https://xemakoxen.weebly.com/uploads/1/3/4/3/134320116/zafolulo-zoteg.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/zegope.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/woxojuxafopuv/97211007087.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/venice_italy_food_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/rate_my_professor_tcc_college.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/97296006495.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/cyc_west_county_basketball.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/ambasamuthiram_ambani_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a86bdd-7896-4e77-b2d2-0283437e71cd/39795431898.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/7875975898.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc526b588c99b6d37c2ed9a/t/5fcccf571e1a4d7de128d531/1607257943220/jebolusimikukebunomekidij.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/90810217074.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/ap_gov_chapter_15_outline.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_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 5200 bytes
SHA-256: 1652b0b507c9cf32850a8d5589bcb48ff6578fc7d5b903521f0c1aade4c6adfb
font_01_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 11060 bytes
SHA-256: 61eeb4446668f53f0187b0f5e084de051fc814968a650e744c21ab8f01b42400

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