Malicious PDF — malware analysis report

Static analysis result for SHA-256 34df2d3f20dffe47…

MALICIOUS

PDF

80.0 KB Created: 2021-03-24 08:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a7e46e93c6e5a97e4054feb09bc7e906 SHA-1: cba29d0fa17a91e9f165347fb399dc3647192e2e SHA-256: 34df2d3f20dffe47f00d603f03c924492c84ab4bcb4e2a0897005f513ac54a49
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=2008+ford+escape+shifting+issues PDF link annotation
    • http://rowowesofazov.medianewsonline.com/zuson.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/fizelesepolodoxuwup.pdfIn PDF document text
    • http://bowodimi.iblogger.org/how_to_program_a_toshiba_remote_ct-90325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/14c1eaae-554e-4784-8795-59d1c0de64fc/sadumono.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_67cbaf4a141b41c6a6e6cf527e989651.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_856f514c0b514c9b9a6798449cf7d082.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_6c93f1345e9f4af0bcdd1502119798d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39822058-105c-4e1a-a222-a72dbc483cd9/tixufusoma.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_76fa93eae01e472db0e41f2ae33dbe8e.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_d39e5af063a04fb58e090368d8b80888.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e4c9c1-3c51-4eaf-ad93-47ddbe9110d1/79198051443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a801abb-8774-4df1-ac86-56bb4c2bc093/39605461983.pdfIn PDF document text
    • http://kifobidurusidi.epizy.com/basitufafuniruk.pdfIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_ca0c7ecc958c4f83a814aa9d4b30ae78.pdf?index=trueIn PDF document text
    • http://xijukogejutaril.epizy.com/design_of_steel_structures_notes_ppt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 5640 bytes
SHA-256: e5fdacc12b3991075b3774ec977c703f22c7275af666ff11d0dd76338466d477
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 10820 bytes
SHA-256: e3ac9099350d0e1348638b9ab8f3504e3e76712ee3996b0ad4f32749ccd584ac
font_02_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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