Malicious PDF — malware analysis report

Static analysis result for SHA-256 053903aa8b9412c2…

MALICIOUS

PDF

72.8 KB Created: 2020-11-10 09:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b537cf0d999093fd256c09b4596ffa0 SHA-1: 5efc5ce6bbb88d236fe9e0a412054a210f39b4a3 SHA-256: 053903aa8b9412c265818ab59f721fa3ee7bebf9da159d0490e38c76131bbeef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm for SEO purposes. One of the primary external URIs, 'https://traffset.ru/strik?keyword=pure+flix+app+free+download+lg+tv', is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffset.ru/strik?keyword=pure+flix+app+free+download+lg+tv
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f87dbddd357d.pdf
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f91f48643208.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f90042c6c6b3.pdf
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/8790609.pdf
    • https://cdn-cms.f-static.net/uploads/4413017/normal_5f9f7b2386472.pdf
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5f95aac32281e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ritoma/f-22_fighter_bomber.pdf
    • https://s3.amazonaws.com/kavitokolezub/kixasimag.pdf
    • https://uploads.strikinglycdn.com/files/883cf12f-6db4-471b-970b-2128606b6a33/15691027682.pdf
    • https://s3.amazonaws.com/pizivurapab/25014543068.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/13630640301.pdf
    • https://uploads.strikinglycdn.com/files/97ab455d-a966-40e7-b6d9-92b73cfb0785/4703924620.pdf
    • https://s3.amazonaws.com/vunizi/there_were_13_original_states_name_3.pdf
    • https://s3.amazonaws.com/wemupajese/86099614636.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_off0000df0e.bin
e781fbe258e651c2adf18fdc8536060a2b31385a2e66ed1643a76ff916f14d67
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 5252 bytes
font_01_sfnt_off0000f11c.bin
12e69fb43104320ed505ac69ecfd85b923ba2829d49aa95bbe542e15a4a60244
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10760 bytes