Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f248afd8e445351…

MALICIOUS

PDF

67.0 KB Created: 2020-11-26 11:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0f18b249a1976b37601e7114a10600f SHA-1: d148c1d50644ce1c434dac05a333ef91c8cbd383 SHA-256: 0f248afd8e44535191e7a94160d7e1148ab0b8168b99ba838455b5b37bf83b6a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external URLs points towards a malicious redirection scheme.

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-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://trafffe.ru/strik?utm_term=ab+glider+workout+instructions
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/redepowisodegas.pdf
    • https://fapadeli.weebly.com/uploads/1/3/4/4/134445247/fowogo_pewaj_balak.pdf
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5fbeff19d305c.pdf
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5fbf124275b8a.pdf
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/1477395.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/5783190.pdf
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/1694331.pdf
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/xirubatelodik_tetufak_wuvuzikesar.pdf
    • https://geguguxe.weebly.com/uploads/1/3/4/5/134513061/ea14a29e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f46827d2-5cde-4212-b9d2-628fafab2bda/the_most_important_gases_in_the_ocean.pdf
    • https://uploads.strikinglycdn.com/files/2ff66c71-5082-488e-a7b4-595341d20ce3/family_therapy_in_clinical_practice.pdf
    • https://uploads.strikinglycdn.com/files/5e36dfe5-f11f-491b-bd58-a8db408096d2/bad_news_letter_in_business_communication.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_off0000c9a8.bin
70fa11ec883b7f34be907cfce42377757477c9f9e4f4810cfad3688139f40c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 5180 bytes
font_01_sfnt_off0000db74.bin
d235ec1dfc1a6dfd5e414559c8f0f56d7f0b00923ac1b333542e9b85729bfc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 10464 bytes

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