Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5911e95fbc4aee…

MALICIOUS

PDF

59.4 KB Created: 2020-11-17 06:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf2c2fc64477259aee0b941554ad986 SHA-1: 1bd92032d4df56dd307227e4026c82c58d89e99a SHA-256: 2a5911e95fbc4aee35af4013a7d6a42357dd84e467a0f637528a49f384155d22
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafftec.ru/strik?utm_term=sailor+moon+capitulo+173', appears to be part of this scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/strik?utm_term=sailor+moon+capitulo+173
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/bamuluniga.pdf
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f9ed83224845.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdf
    • https://cdn-cms.f-static.net/uploads/4443802/normal_5fa0db10387ff.pdf
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/580a38a9e86bd4.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/e6c4dd.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/f8339bac762.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/22886a2d-73c8-447a-9a2b-c0fbd0d9943b/wiguti.pdf
    • https://uploads.strikinglycdn.com/files/20501221-aaa4-417e-a8ab-18fbc2a0b3d3/8663003438.pdf
    • https://uploads.strikinglycdn.com/files/5e56c51a-9dde-4feb-b4bf-59d5bb5735a5/54518917976.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_off0000ade9.bin
3f1013102721487ab7079025e812e528ad453f179c2d519806fdadf0ee89c473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE9 5300 bytes
font_01_sfnt_off0000bfeb.bin
2df0586ec12af6936b247b59f93b78619751a5edbb41a66e9462124ca4888471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 9220 bytes

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