Malicious PDF — malware analysis report

Static analysis result for SHA-256 9705e35c0cc60ecc…

MALICIOUS

PDF

74.0 KB Created: 2021-01-08 15:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81354378e7a9d848c79627c27e5a23ea SHA-1: ef492ff0fd21b0b46bbc96c68769a35196a866f9 SHA-256: 9705e35c0cc60eccf353da427495f0aab0f613770173c2530268fd7d0676f631
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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://traffnew.ru/aws?utm_term=stand+up+bass+sheet+music
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f88bbb5440af.pdf
    • https://cdn.sqhk.co/lamijaluxeso/bY409ii/16802048011.pdf
    • https://pekireraseg.weebly.com/uploads/1/3/4/7/134720831/5dd43b11b.pdf
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/punoluradefafo_gipobog.pdf
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/5540886.pdf
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/kotubisun.pdf
    • https://static.s123-cdn-static.com/uploads/4370087/normal_5fc5e96f00c06.pdf
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/simimadifos_natukofuduba_lariraxigezige.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/34cd9a3b-db79-44c6-b394-df25f6eee8a9/nudonekavibunobapim.pdf
    • https://s3.amazonaws.com/dazinibonofobi/98678338974.pdf
    • https://uploads.strikinglycdn.com/files/a2338d79-a9f4-4463-ae7d-6d9a4c54c5d6/tozifinofosorufoturu.pdf
    • https://s3.amazonaws.com/godewumazek/archive._org_games.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_off0000d747.bin
26406bc890b6bdaea711c88d9c4065d1b59b9678b6bdcfff957eed94ba2a7c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 5200 bytes
font_01_sfnt_off0000e8b7.bin
30acf347ac2ff5818a9e290a459b5fb9e2def8203bcae03749e3cebc9952be44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 10736 bytes
font_02_sfnt_off00010d75.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 4324 bytes

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