Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c86c559c6738b9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 10:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 06402960ef356bbc131c4b6745403975 SHA-1: ddb3c6c8f7a32523983ede45afbd47430db1125b SHA-256: a6c86c559c6738b931bcff8b9e39a564485dacf10a13b4f5662e2650e88f5c16
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, and one suspicious URL (https://xezojetit.ru/123?utm_term=bike+race+hack++ios) which is likely part of a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xezojetit.ru/123?utm_term=bike+race+hack++ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462352/normal_601212e08a611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_601608b752376.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/kadivupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_60066cb31c873.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/harley_davidson_repair_shop_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1e76b7-03cd-4bb0-8e70-3d039ca67e33/is_sense_and_sensibility_a_romance.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/51848055963.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_784d667afb1743bebc8959fc7e4a8a6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ba0cd2-e939-4bec-a2ac-265c8c716dcd/kujubegamatunezabo.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_3874609db14446c7a471d00409fd814b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/georg_fischer_cad_library.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15fda5a-e395-431f-adb2-b945e2ac732b/dell_precision_m4600_launch_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fd741f-8c88-4cec-9e60-e82efb5f9047/92788500616.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/sozibejixofobomoz.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_9ebcc9a792cc4799a7a66d326064087c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d3cd78-100a-4b5b-ab3a-86bd4e448fed/beretta_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f21d9a-9d0c-4f31-81f9-131300ff170a/gekupefab.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_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 4968 bytes
SHA-256: 9783840d6306ba8be0fd0669afd3e8d4b25dce6592a40188eebb21bc751616fa
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 10992 bytes
SHA-256: 8d0f06f25cfdddd936d00aa7f7d2788aead8b08d60fe0bf747a8a18a2d6d7db2