Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ae920d73e8c839…

MALICIOUS

PDF

78.1 KB Created: 2021-02-15 16:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c05ebe3d46e5f6d0faeebb9a8a71ce8f SHA-1: 506c3549258b19a2c42dd28f20bd8db553d8bbdb SHA-256: c1ae920d73e8c839a46cd439a49e8d513f5b34d1cb1561b413f7c7e9c714e65b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crophysi.ru/123?utm_term=dbx+160x+strapping PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451375/normal_5fd114d99c371.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/g3ggheo/gopro_live_chat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fcb987d21735.pdfIn PDF document text
    • http://rovexomakegan.22web.org/sheetz_mac_and_cheese_bites_review.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/2205336.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/bajbif3/82420026351.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/230f8.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/ajaidjj/50619174417.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/tisixaluj_butipokewuloka.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/fijuroguzokofin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_5fe640a676acd.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/jiZLEgd/68264499092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kupobazixivev.rf.gd/khatu_shyam_ji_video.pdfIn PDF document text
    • http://gusutawidike.epizy.com/rinejuminuk.pdfIn PDF document text
    • http://nobudusoselazo.epizy.com/dujelexuxuwenesoser.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/31567750742.pdfIn PDF document text
    • http://supapimegem.rf.gd/aao_kabhi_haveli_pe_dialogue_video.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5512 bytes
SHA-256: 1b83637f489469a61bbe840193b94f52eb9a817d528e207ccaacd3d6423fefb1
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 11068 bytes
SHA-256: 88db287c1bd874da56b765f65777c88d1b8e9beb5942722933d0779f9d59bced