Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb2f6fa9372da22…

MALICIOUS

PDF

79.4 KB Created: 2021-02-15 17:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a682ecbedc763197c725082c6057cd40 SHA-1: f6bb3b1e545040a0bf11ac9ea9375b81643bcd21 SHA-256: 9fb2f6fa9372da2251ed798211e0fc0e6d9e7d6efb0c39a9f16815cf8ee8d011
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru' and disguised with a search term related to technical documents. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=plate+heat+exchanger+design+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5fd27f0439d52.pdfIn PDF document text
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/noxelatunep.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/liwasunan.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/gggjCig/discord_werewolf_online_free_play.pdfIn PDF document text
    • http://carbags.site/dragon_ball_z_shin_budokai_2_mod_ppsspp_free_downloado6w9b.pdfIn PDF document text
    • http://consequences.space/vatalunewuligamuzirodaxiyuc9r.pdfIn PDF document text
    • https://cdn.sqhk.co/fudopalizew/ijeicgA/lemesorasul.pdfIn PDF document text
    • http://50off.pro/xopigikajutekemutirunocm9da.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/lekelit_rumatipoxa_nonemitogenudop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fea2dfda759b.pdfIn PDF document text
    • http://cancandance.org/medical_lab_assistant_interview_questions_and_answerscrlog.pdfIn PDF document text
    • http://tendernes.ru/electronic_music_circuit_guidebook8bmpe.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/2342768.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/idjhgGt/regal_cinema_16_closing.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/24890.pdfIn PDF document text
    • http://tamakar.xyz/best_gaming_live_wallpapers_for_pcmck4o.pdfIn PDF document text
    • http://daniele.store/29517119338w6wif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fd9d06ba3c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_602105b439909.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/giwuwodosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 5484 bytes
SHA-256: 2265de94b21faffb9734ae6b5d2b2743649c53ee714c405c26a54947971111e5
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 11764 bytes
SHA-256: d5fcbaab002f62cb867dd40301429b135f77f84e02ad057eb0362b81894c05df

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