Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a8f1fb0280269b…

MALICIOUS

PDF

73.3 KB Created: 2021-06-09 02:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1a97bcc72c56641328033e9e544b4273 SHA-1: 6a59acdeb7b1dba05b720061212af3e5b6cfd62d SHA-256: 82a8f1fb0280269b423c81778a8274ea64f3055d4d2cd329ee21524bcbc83afb
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'medvor.ru' and a query parameter suggesting a lure for social media engagement. The document body, though heavily obfuscated, contains fragments related to Instagram followers and the authoring application, reinforcing the lure. No scripts were extracted, but the presence of many external links suggests the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/pbw?utm_term=instagram+auto+followers+online+without+login PDF link annotation
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/7394798.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/guzizom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_603b2eb1bad0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fee635a935e7.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/a2cb94c.pdfIn PDF document text
    • https://lepifopinitomo.weebly.com/uploads/1/3/2/6/132696280/muzatizenonoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fea42b4b3558.pdfIn PDF document text
    • https://vimopoferozure.weebly.com/uploads/1/3/4/8/134858925/sogajukak-dupapovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolasotosexu.pbworks.com/f/zutodegavoribilugedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c260db-6ecb-4a01-ad3e-96b0bf288379/what_is_chat_message_tracker.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144873354/10096062815.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/f/what_is_straight_no_chaser_tour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d003e553-fe5c-44b7-9b68-a3e7f77d6baf/rekazawimugad.pdfIn PDF document text
    • http://moletose.pbworks.com/f/the_land_of_the_open_graves_summary.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144505299/how_many_calories_in_a_starbucks_grande_vanilla_latte_with_almond_milk.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/bleach_immortal_soul_tips_and_tricks.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/what_is_the_importance_of_business_research_in_our_daily_life.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/f/preguntas_y_respuestas_sobre_el_texto_borges_y_yo.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144793911/sexejubujijagofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0b5888-d073-4e8c-9a66-98c6daad40fb/22691440458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b05fd58-de66-4458-8407-d9a6918fb31a/89840702582.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144512646/novela_el_cuerpo_del_deseo_capitulo_35.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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 5208 bytes
SHA-256: f17c5dc460e2a5d5a5e9488d126059fd3dbea98ea55a90df57b2dcec07c6a557
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10436 bytes
SHA-256: c9a9d6906081ad0c39ecf0417ab855f011cf1f0992418407eb8d11df432e9f66