Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecf17325996c493…

MALICIOUS

PDF

67.3 KB Created: 2020-12-21 05:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53b9f6e66d51de56435b78291115f038 SHA-1: 1e72f0fa5c9984b1f4b3d04df35fd46955dc824c SHA-256: 3ecf17325996c4932190dd4749367a476912456aaf23f1381847009d1917dae3
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially harmful websites. The document contains numerous external links, including one pointing to 'https://trafffi.ru/strik?utm_term=facebook+lite+apk+latest+version', suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=facebook+lite+apk+latest+version
    • https://vurozagagi.weebly.com/uploads/1/3/4/6/134695821/deranemuxajizo.pdf
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/4289840.pdf
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/98f83d50b.pdf
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5f968fc67fafc.pdf
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/3716254.pdf
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/duwutuwosipumusamu.pdf
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/zetutikozodow.pdf
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/5d34bed0.pdf
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/4b904d506b94c.pdf
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/fowiwiwow.pdf
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/fupal.pdf
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/4756959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0e14dbc-74e7-4e17-a967-e30d3ed6e49a/sm64_star_road_rom.pdf
    • https://uploads.strikinglycdn.com/files/d0ff0e6f-cfc8-4992-8d7f-297764de818a/abstract_reasoning_test_2.pdf
    • https://static1.squarespace.com/static/5fc64bc08ef7301f8b35bd0e/t/5fd6c40689566e781f5dff51/1607910407798/69847156080.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_off0000c07c.bin
7f69de41e4772cda663aa8a81cd602ffd0c0b9ed603bdbb080847e71c311307a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 5144 bytes
font_01_sfnt_off0000d212.bin
c8dcd0e8fc625ffdabc5fa25f36ac5ac6d5be2892aec152d7fb875be118c9836		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 14876 bytes

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