Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e8bd82b23a2931…

MALICIOUS

PDF

67.7 KB Created: 2021-03-24 10:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 920ff26195f9c60515beebc1fe021a0e SHA-1: aae8465ee2b5879aaa618711042d39ffa01a6383 SHA-256: 86e8bd82b23a2931d2777a40c0b9fc28394e6b5ed52ba29186f375bf3beaefdc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://ponafet.ru/123?utm_term=backwoods+logo+template', is directly referenced and appears to be the primary lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users, potentially for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=backwoods+logo+template
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/xudotuf_bivotozakopaw_biwuza_tigugaduwuzaraj.pdf
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/gapob_betewokitivivix_kazobuluvede_ratoritulizux.pdf
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/a60f2910.pdf
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/vaxetepakamula-najebometup-dasetizusewe.pdf
    • http://gepexoliv.medianewsonline.com/xesovujetesofevo.pdf
    • http://gojevomarokabe.getenjoyment.net/blending_words_for_grade_1.pdf
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/a27b2a7.pdf
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/xebegubudelumi.pdf
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/tumenot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sevoga/35853765257.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_576f8f56258043ea9e2ca6b27398cfde.pdf?index=true
    • https://s3.amazonaws.com/rewepalazamiso/como_desarrollar_un_algoritmo_matematico.pdf
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_b085bfca7a5b4f3d8e57ab5ed5189462.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6e30912-ff5d-4b02-8d1a-aa99743e70dd/message_erreur_accu_chek_performa_e9.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_a2e0fcaf46e94035a0e843040856cecb.pdf?index=true
    • https://s3.amazonaws.com/kikunojulejuj/salajazesixavagu.pdf
    • https://uploads.strikinglycdn.com/files/0929023e-0ebd-457f-a3f3-8d5960a2ef25/john_deere_l110_steering_parts.pdf
    • https://s3.amazonaws.com/kovezodepugov/lilupej.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_93ad51bfa2b245848c0c3355aea8a2cc.pdf?index=true
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_80763864037d44a8ae23fd5898185308.pdf?index=true
    • https://s3.amazonaws.com/rejiner/lotus_notes_8._5.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce9.bin
603751b2f163baff4c3ec9bc5454fae35d97e9eed8c30695cb8c008f5d7080d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 5504 bytes
font_01_sfnt_off0000dfa9.bin
b009b6144df4730cf5b9b56b3ce7bc3a267eef965ecf35cecd7472c9bab42d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 9980 bytes

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