Malicious PDF — malware analysis report

Static analysis result for SHA-256 a679ea8eae909b3b…

MALICIOUS

PDF

93.3 KB Created: 2021-03-28 05:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 689e0276eaf4eba03c285abc6c6906b7 SHA-1: 24bbbf9882537bcf0ef49a69d85882b6106b11c0 SHA-256: a679ea8eae909b3bcc53088bfd333a065f91f40499116927f56c79e3a226d2a7
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links and a heuristic firing for a 'download button lure', indicating an attempt to trick the user into downloading a payload. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/award?keyword=built+to+last+successful+habits+of+visionary+companies+free+pdf PDF link annotation
    • https://cdn.sqhk.co/gijesali/dxz1m9j/zombie_football_player_costume_uk.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/fe8ed6df2.pdfIn PDF document text
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/d0e476ec4.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/c4q2voa/dreamtopia_unicorn_pet_doctor.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/fYfoTd8/maserati_quattroporte_gts_specs.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/limulawewikixozudaf.pdfIn PDF document text
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/62c4b.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/gedew-xufaretedes-tiwubo-vinixobemevufa.pdfIn PDF document text
    • http://nefusetas.iblogger.org/80113992846.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/tgfMmgg/23112250967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumatefofexulen.epizy.com/17232841435.pdfIn PDF document text
    • http://jemekeluvakowop.rf.gd/87711108354.pdfIn PDF document text
    • http://kilobawul.rf.gd/64110643710.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/22533874594.pdfIn PDF document text
    • http://padenijuwike.rf.gd/lavatumiveguxixumaloje.pdfIn PDF document text
    • http://segenuf.rf.gd/66296312556.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/3320899944.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/63734105545.pdfIn PDF document text
    • http://jetupilesoz.epizy.com/lewataberodisewi.pdfIn PDF document text
    • http://jipakevinofulom.epizy.com/barthel_index_score_0_100.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/bunanapikeforivamebe.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/85394253466.pdfIn PDF document text
    • http://vezoxonu.epizy.com/bixuwalole.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/kamibodufetisetef.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 5744 bytes
SHA-256: 2b6f3cfba57a2bbfe85f9c2f1929f2bd139bbca013228348bc6c76387c4b3457
font_01_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 11280 bytes
SHA-256: 479df044ae0b9ffb1ebb0af75d103e135718731040c37d2170c96560b144130b

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