Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc8bcc6e364f68f…

MALICIOUS

PDF

79.8 KB Created: 2021-05-23 19:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5c324a293717962d4851965ffd23bf5 SHA-1: d66fa86c9fdf4a2a39d36ea064216b84b2a88a5c SHA-256: bfc8bcc6e364f68f88e2e868af1cc5c48a5808a7de6aa35d3cf9518aab22b2bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=root+insurance+commercial+girl+pew
    • https://cdn-cms.f-static.net/uploads/4453142/normal_603e85acaaaff.pdf
    • https://cdn-cms.f-static.net/uploads/4500425/normal_6039127f9a626.pdf
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fe114676e793.pdf
    • https://cdn-cms.f-static.net/uploads/4471946/normal_606360dade09e.pdf
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5feda476f0475.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_602b11e60a18d.pdf
    • https://static.s123-cdn-static.com/uploads/4379616/normal_60089b1ae4965.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_604da5a520e5f.pdf
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fc86c75be285.pdf
    • https://cdn-cms.f-static.net/uploads/4409616/normal_6041fe7cf25e0.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_60261e9ea9c50.pdf
    • https://cdn-cms.f-static.net/uploads/4425227/normal_605f4db644efd.pdf
    • https://vudovonijojor.weebly.com/uploads/1/3/1/4/131437364/e2236aff1.pdf
    • https://cdn-cms.f-static.net/uploads/4453115/normal_602df5c37c92e.pdf
    • https://cdn-cms.f-static.net/uploads/4380701/normal_605977bfd6a56.pdf
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60217d1004c0e.pdf
    • https://cdn-cms.f-static.net/uploads/4410207/normal_6045e6010ce29.pdf
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/vewemugirafogipamuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tokatefozude/hound_of_the_baskervilles_cast_1939.pdf
    • https://s3.amazonaws.com/zatasipezeg/49171213907.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6f.bin
280349c5c13ebbe9f596805a75a63cdfb332819269b4d55fdfedca7f1088f1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 5236 bytes
font_01_sfnt_off0000fe33.bin
9003e65eba26de7d448418a2f0a6f5e66094826fb39d4e62e5f1dcafdbbe12b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 11040 bytes
font_02_sfnt_off000123e3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 4324 bytes

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