Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd8d27c7f3fff54…

MALICIOUS

PDF

139.2 KB Created: 2021-02-16 01:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a3c2e9f60dbaaad934774af7b8c3eb8 SHA-1: b4496acc3b22e7dfd0c77760c79a1914b3ab68b6 SHA-256: efd8d27c7f3fff54a538035958a411f8d15577aac8654f8220257a2de55ff3dd
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure suggests it's designed to redirect users to a network of disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/wb?keyword=2020%20model%203%20long%20range%20horsepower PDF link annotation
    • https://cdn.sqhk.co/takabalal/aji2Wgi/33472732532.pdfIn PDF document text
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/9075676.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/xavizodovuna-navufudinugagi-julobovejewad-sijipebikazapa.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/dc14c.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/Uji2nGk/download_3dtuning_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/J5u0jib/seguzibabovefezi.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/8CqpGuK/crazy_bike_attack_racing_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusawaja/jDje5UN/80187269032.pdfIn PDF document text
    • https://mutalexo.weebly.com/uploads/1/3/1/8/131871787/xurejofabalurisuzow.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/4731647.pdfIn PDF document text
    • https://cdn.sqhk.co/wujodazera/sTdijWf/download_game_bike_jump_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/ZRib6ig/sojupirones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5ff4fb81a9cbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezedavepajizum.rf.gd/146888603.pdfIn PDF document text
    • http://lowuzoduveloga.epizy.com/2228049878.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9D0 5808 bytes
SHA-256: a31330a5ee047ab76d8add7b781e4a1f366f16205cec83e6964c0e7f7244b0cc
font_01_sfnt_off0001dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD75 14320 bytes
SHA-256: 205241d8d3a1533815cbba5ba767dcf9d8dacaf7ae8f80983bd69f2b27553ed1
font_02_sfnt_off00020a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A05 16116 bytes
SHA-256: 4d0f2fdb978c97a40de6dc7ae7321f1d8e76aede85bc9fe655b3713185a8fe07

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