Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f799c422704e9a…

MALICIOUS

PDF

134.3 KB Created: 2021-03-30 10:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f983dbcead436432629ae1b22ce79d SHA-1: b85ff3a3f71583053f2df601b56b4721c35cac81 SHA-256: f9f799c422704e9ae3f81fccf3d4be356e30da6b2568ccbcb12632f6db57641f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to `https://golowaki.ru/award?keyword=prefixes+and+suffixes+list+and+meanings+pdf`, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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
  • 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://golowaki.ru/award?keyword=prefixes+and+suffixes+list+and+meanings+pdf
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/7653685.pdf
    • https://nalebetiraj.weebly.com/uploads/1/3/4/6/134669494/tiwaxipadof.pdf
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/zigemebukevidamep.pdf
    • http://sesesuruko.mypressonline.com/zevoboxiguxedejokabej.pdf
    • https://cdn-cms.f-static.net/uploads/4470401/normal_6023882589457.pdf
    • https://cdn-cms.f-static.net/uploads/4500447/normal_601d97fb2491d.pdf
    • https://fopisurotow.weebly.com/uploads/1/3/0/8/130874034/7327710.pdf
    • https://cdn-cms.f-static.net/uploads/4498883/normal_60303d6334777.pdf
    • http://gumidaz.medianewsonline.com/foundations_of_algorithms_5th_edition_solutions.pdf
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/8216555.pdf
    • https://zazukesoj.weebly.com/uploads/1/3/4/3/134317965/448598d.pdf
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/nezulir.pdf
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/jivefexi_jodukozamom_ledod_tolorewukifav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_8fdbf4820a0349348f836bcefc8a9159.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a255e9a3-83d4-47f8-a2d3-c881e7815437/bubojokuviketodadona.pdf
    • https://uploads.strikinglycdn.com/files/a8532a02-a660-4c79-9415-d8358eab224a/stress_level_scale_1-100.pdf
    • https://uploads.strikinglycdn.com/files/36c7172e-ba53-4fdc-a123-f059d933dcf5/81308837861.pdf
    • https://uploads.strikinglycdn.com/files/c74287b4-a5e2-436a-a398-a8d5c5c5f240/tobenetanalagadadoguju.pdf
    • https://uploads.strikinglycdn.com/files/c0cd2da0-1f76-4431-9be3-79307390a8a3/tapigok.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_a64871b2e5144c688ac02c41b35aae2c.pdf?index=true
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_83bea70edbf3475682242f1c6e993e8e.pdf?index=true
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_f53926cf577247c98d55b573fc009a59.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aef3.bin
7fd85272eb1300cd43fefc842ab37546d4517896591ba0f7f57a081532563374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEF3 5204 bytes
font_01_sfnt_off0001c082.bin
a8a577b1164de09de4153ebc5d9467aabc28ef38ba177e32e906432bbb9a425d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C082 25032 bytes
font_02_sfnt_off0001fc9b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC9B 4324 bytes

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