Malicious PDF — malware analysis report

Static analysis result for SHA-256 16af33d5a2557d24…

MALICIOUS

PDF

65.5 KB Created: 2020-12-23 17:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 38d343f20a8d6757fc8e6d8c419f055f SHA-1: 33f8a1eb79f8d83df0500fdb4197e3f5a32d6e35 SHA-256: 16af33d5a2557d24ce01054ad8c1d878251569a2c154b401b70415aef6fbb3af
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded links are the primary indicators of malicious intent, likely leading to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=monster+collecting+battle+games In PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/tosepude.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/tjcrieo/3d_live_photo_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fce6fda4fe8a.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/CUjfbEq/spectacular_smith_net_worth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_5fa42045d1ce3.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/bisapovepizaj/formal_gowns_online_shopping.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/sleeping_barber_problem_program.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/pezazaseno.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/36855772280.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_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 5264 bytes
SHA-256: c198d4e82a6b77af40a8e376ff1001fa4f4c87451bb9140368c3ae564bf6e517
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10076 bytes
SHA-256: daf212323d4259ff33ea5df8721cd4f6931165b9081e355b5f6c3c0b02ba256a

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