Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cff9220e84a35c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-22 05:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8523d0db6fd9f9c9bf74714657e2d7a0 SHA-1: 6dd15c54f5781ed286c9216af1e79b1f7c66b628 SHA-256: 01cff9220e84a35c5a72fecd7b81b1f66ba07e72d14a8b59b8ae3a5c0fc555d3
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=ultralight+backpacking+tips+mike+clelland+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470835/normal_6028ee0b568d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_603465a3d1402.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/b7fc67047.pdfIn PDF document text
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/5652886.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/donevabuz.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/mubik.pdfIn PDF document text
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/5808838.pdfIn PDF document text
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/fupasiniwok_rujewome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_6027ce865f04a.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/revokubizupumujena.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/migaletigiz.pdfIn PDF document text
    • https://vibitaxipeni.weebly.com/uploads/1/3/4/5/134526550/4f048e45b.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/6535603.pdfIn PDF document text
    • https://nefipoxitusi.weebly.com/uploads/1/3/0/7/130775115/pokol-rogaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_5980b3971a434f159f4060df469a0ccc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e6f844-8f7b-4eb0-a5de-b554879e2ac4/keeping_god_at_the_center_of_our_lives.pdfIn PDF document text
    • http://gafodix.myartsonline.com/addition_with_regrouping_worksheets_for_grade_3.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_eeed190e83544eb181d734bbdd0db218.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba7dcac-60c7-4564-aa1c-3de3ccd6b72f/what_did_john_paul_jackson_die_of.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_04bff8fc031f44409739dc7b6fb61ddb.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_104cc0b234f34423a1f4e5a995a26a4e.pdf?index=trueIn 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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5764 bytes
SHA-256: 123cc87240e8f2821ffe6b739c4d15141ae165fd6fd18145128b6d6ae723bc71
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 11004 bytes
SHA-256: c9728210b7001edafb2bba21db534a31e00c2c824a4cea01f229328fe567ae38