Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f56f23183e3ef4a…

MALICIOUS

PDF

60.0 KB Created: 2020-12-25 02:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cfc33f4b7946ae6ce7c969409ff6d6 SHA-1: 1e741f35463c58c25839d0b7aa7946284d05ed13 SHA-256: 6f56f23183e3ef4a20e41c4827405b4b8ab2f5e541b78b16aba6cf4d8b1ec48c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to disposable hosting services, suggesting an attempt to redirect users to potentially harmful content or phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?utm_term=mars+time+delay+relay+32392
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/kekunolelix.pdf
    • https://cdn-cms.f-static.net/uploads/4493541/normal_5fb48b8a310c7.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/7535962.pdf
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/1429013.pdf
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fa069e007f83.pdf
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/4976819.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f93968c84e01.pdf
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/vejetewidedoxan.pdf
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/3479606.pdf
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/tobevorebibuwen-rupubezefan-lonipa-guboloxafiwemum.pdf
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5fe433f7990a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bakoloj/door_lock_2018_movie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad5f.bin
e5e5214c9abf91a7947084760137ba57c587258d1ab5b60221e0de603c1adc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5F 5532 bytes
font_01_sfnt_off0000c01f.bin
50bc78faad08e968e4586c06dbb68825cc53e28eee9589809d8c23e8baa3af4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01F 10468 bytes

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