Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef14e84c987075c1…

MALICIOUS

PDF

75.0 KB Created: 2021-03-02 06:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a63daf90bb0ffd53c9f308bd2ab707d8 SHA-1: 1df5b8d1db8494bdbb7539928068a3855024d48e SHA-256: ef14e84c987075c1702dd15247db01b05002ace2883fb50be52bfb2f494c8ac5
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically appearing to be a search result lure for "how to reset heater pilot". The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+reset+heater+pilot PDF link annotation
    • http://pupezawat.scienceontheweb.net/39906757325.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/bgie36p/19650572311.pdfIn PDF document text
    • http://xijafagupigor.22web.org/how_nike_implemented_lean_manufacturing.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/MjOhhAV/xisupawedodevulomomoj.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/oJGgeji/carx_drift_racing_mod_apk_1._10._1.pdfIn PDF document text
    • https://cdn.sqhk.co/mivoteloxip/5gcKsoD/happier_lyrics_video_download.pdfIn PDF document text
    • http://jitudujugizewo.iblogger.org/tetetuxolewisi.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/54296687262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_6033ffa1e3794.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/gjdghji/company_of_heroes_board_game_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/mini_explosion_box_template.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/10th_cbse_board_exam_2019_date_sheet.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/silence_is_the_language_of_god_all_else_is_poor.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/46177666179.pdfIn PDF document text
    • http://midelex.epizy.com/zovinobe.pdfIn PDF document text
    • http://tadobobovukag.rf.gd/pezaxitaduwabile.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 4960 bytes
SHA-256: 6fb95109e2a8f6a57022fb5143c357feee863f1b605a5ac29dedbb388600d386
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10740 bytes
SHA-256: 7bc8ffb63e4106712e9917e4675898b0eb7b9066653a21b8d55d157a0404e803

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