Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f923cc9dc78a4fa…

MALICIOUS

PDF

75.8 KB Created: 2021-05-02 02:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 917858c85d10f2696a913fcd70060b46 SHA-1: ab9fee58750388c4d55cd1636036c39400f7960e SHA-256: 5f923cc9dc78a4fa31fb92c4ef729ca7f785daa145ed4675426ee61844c8324d
166 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous external URIs, with one pointing to a suspicious domain ('ponafet.ru'). The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely attempts to trick the user into believing they need a password for an archive, a common social engineering tactic to bypass gateway scanning. No scripts were extracted, but the presence of multiple external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/strik?utm_term=how+to+factory+reset+a+nextbook+intel+inside PDF link annotation
    • https://cdn.sqhk.co/wubukuxivupe/gAASAsA/vikings_cast_season_5_freydis.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/rebexumabopodenujikemitat.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/jJigQ98/john_nes_emulator_full_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/jgtdtge/8142265981.pdfIn PDF document text
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/28ed39c0a6cf.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/Ugghb0P/love_nikki_dress_up_queen_guide.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/besizodutiwexok-ginofipipel.pdfIn PDF document text
    • http://vutanari.22web.org/wamawiz.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/anticipation_guide_template.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/22002811712.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/zalomi/how_long_should_you_cook_chicken_breast_on_george_foreman_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/nice_guidelines_for_familial_hypercholesterolemia.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/7738365454.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/kyocera_duraforce_factory_reset_password.pdfIn PDF document text
    • http://fexijedapafob.epizy.com/the_flowers_of_war_book.pdfIn PDF document text
    • http://vowafixugologu.epizy.com/short_gut_syndrome_diet.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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 5444 bytes
SHA-256: 963166300c500259c8bbd3a7ee0c208dd2086eaf26ccc28a76cd8ea2a916f462
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10176 bytes
SHA-256: d54cef360db42f7e478271b60a81b995b64ab5ae3fdcc918dbbeaf13989d2e43

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