Malicious PDF — malware analysis report

Static analysis result for SHA-256 71687cb4c654acea…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 21:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384e093ef795f908a242f4911551ced4 SHA-1: e5e9dadf783cf42c2e3e34aab121b12b018c5ed6 SHA-256: 71687cb4c654acea17b53b10b42f908bbb7e893b5aa9995c8ee239b2b9b2b55e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, including one pointing to 'https://ponafet.ru/award?keyword=acca+f8+notes+pdf', suggesting an attempt to redirect the user to a malicious site or download. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=acca+f8+notes+pdf
    • http://dokojekiferej.mygamesonline.org/nostalgia_soft_serve_ice_cream_maker_instructions.pdf
    • https://static.s123-cdn-static.com/uploads/4497372/normal_6009553264c49.pdf
    • https://ferutijuze.weebly.com/uploads/1/3/1/8/131856408/gagago_timimagedo_tusipatikesim_jajaziw.pdf
    • http://tujukesabegakom.mygamesonline.org/kotepiwafalere.pdf
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/zojemitapej.pdf
    • http://fajasated.mywebcommunity.org/vocabulary_games_and_activities_peter_watcyn_jones.pdf
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5fd7a5b60fe8b.pdf
    • http://i-men.ru/83511150184p7kb7.pdf
    • http://afracheat8.xyz/captive_gendersmyewm.pdf
    • http://dokojekiferej.mygamesonline.org/how_to_mix_colours_to_make_black.pdf
    • http://kaxiwemusemoj.mypressonline.com/sociological_imagination_essay.pdf
    • http://lunatan.medianewsonline.com/lisejaxiduroxefana.pdf
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/f672c62c.pdf
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/lomizat-nuzaxaxogifode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kugukokoner.myartsonline.com/fumofekogezupuwa.pdf
    • https://uploads.strikinglycdn.com/files/bebe4ccf-c7ff-4595-bba7-d0eb23a10419/how_to_study_for_navy_advancement_exam.pdf
    • https://uploads.strikinglycdn.com/files/eac9b486-0218-403e-abac-8cf355ec0551/vudugilatewefijagimujag.pdf
    • http://zavulelobawabi.onlinewebshop.net/84695151031.pdf
    • http://lufevexos.atwebpages.com/15952411845.pdf
    • https://uploads.strikinglycdn.com/files/6138b91b-68b3-41c1-8bce-f1c6ec576c74/woratasofagotizolu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1d.bin
87535a84f4a39be8e219593ead9f65e33da4f51b805d8acb0347be52dfa56ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 5204 bytes
font_01_sfnt_off0000eef2.bin
ae01f582cf3f07bc679a447359c918d6af094d78e70ef69b1c070e95b9c428d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 10712 bytes
font_02_sfnt_off000113f2.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 16204 bytes

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