Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef84f65096a6391…

MALICIOUS

PDF

76.8 KB Created: 2021-02-16 16:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e8d93226efbc5d7b3f041d872665105 SHA-1: 29cfbfd4415333fedaf82791981be51176b55c6f SHA-256: 4ef84f65096a6391db7ee7f88762256c9e793ae0ae1e88bbbe6c707cb01b090a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=lg+fridge+mechanic+near+me PDF link annotation
    • http://idealsit.space/32794426260x1721.pdfIn PDF document text
    • http://future-techno.ru/android_10_para_xiaomi_redmi_note_7spm8p.pdfIn PDF document text
    • http://nafugelinev.iblogger.org/70855748792.pdfIn PDF document text
    • http://white-x.fun/boi_apk_freex6rls.pdfIn PDF document text
    • http://help-business-media.com/16076743396pbypu.pdfIn PDF document text
    • http://aarbuz.space/depopepinfg.pdfIn PDF document text
    • http://cleaner360.shop/pool_billiards_pro_hack_apklr7i8.pdfIn PDF document text
    • http://epaytds.xyz/42947834260zla6q.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/financial_modeling_simon_benningauepqe.pdfIn PDF document text
    • http://bcipreactivaperu.com/magma_orb_buildunsbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xumozokuzutibuk.epizy.com/army_mission_brief_format.pdfIn PDF document text
    • http://telagivepovadul.epizy.com/flipkart_honor_9n_quiz_answers_today.pdfIn PDF document text
    • http://giratas.epizy.com/use_spotify_web_player_on_android.pdfIn PDF document text
    • http://nitesegu.epizy.com/zefogokuluwanufasujak.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/lepuripitoluwajivipelewep.pdfIn PDF document text
    • http://duwudipifajekod.rf.gd/38647344142.pdfIn PDF document text
    • http://fexojuvaf.rf.gd/nuzolatalirorujox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5168 bytes
SHA-256: da761c466e8304419ad72ae28d10a14b667a19bc79c7760a303e537141c4d7ef
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 11960 bytes
SHA-256: 2c03b953752825a726a24deb7174ac175e33385ce9fbd8183d38f416ba8d4d06
font_02_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 3468 bytes
SHA-256: 61d73c15dfd1fa5e9fb907a98514711faa9374f9c06e2b735f49877aecee91f6