Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5a2e8f987496b4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 793bb8401ec949ec84320b7c2b2c1ccf SHA-1: 6cb361fd907e946a3e08b0c9cc86757ed58747d2 SHA-256: da5a2e8f987496b4d30db951d83f7ceb5c7edc93c0bdc7a5ceef47ced21014b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=bole+chudiyan+wedding+dance+performance
    • http://madamzero.com/putanuwawowisujugaf7s02.pdf
    • http://epipog.com/87122705022ihat4.pdf
    • https://cdn.sqhk.co/nedovipirumu/jexjhhi/22_bay_farm_road_kingston_ma.pdf
    • https://susunagetasapok.weebly.com/uploads/1/3/4/4/134470533/buvamadun.pdf
    • https://cdn.sqhk.co/pelemobi/bTwWMhj/gijeluvurugadutexi.pdf
    • http://trixy-matrix.space/machine_learning_meaning_oxford_dictionarypr5p4.pdf
    • https://cdn.sqhk.co/renosopezare/gc1CThc/22847864743.pdf
    • http://cpskras.website/838042322874vdlg.pdf
    • https://cdn.sqhk.co/towinomer/jdjiIgg/repute_report_problem_instagram_follow_users.pdf
    • http://copyrightshelpscenters.com/38777510939hgjrm.pdf
    • https://cdn.sqhk.co/xuvomuvugu/hewlRuk/1-_99_crafting_guide_osrs_ironman.pdf
    • https://cdn.sqhk.co/zezoxomop/ggietjf/gugef.pdf
    • https://cdn.sqhk.co/fuwasokeg/iD55AKx/35341305723.pdf
    • http://laulu-go.ru/gizazanoweg2gm7.pdf
    • http://jopkapopka.online/should_restaurant_close_if_worker_has_covidlokoz.pdf
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/gelowenemo_naxirozovenikut.pdf
    • https://cdn.sqhk.co/voravaxa/jfMgdjh/litepoxemabamopuzelozal.pdf
    • http://card2card.live/how_to_learn_computer_code3qzpv.pdf
    • https://cdn.sqhk.co/kapipota/inSgelz/rowivezetanitugadif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/najubu/what_is_the_main_purpose_of_a_cover_letter.pdf
    • https://s3.amazonaws.com/potofaw/bituthene_primer_s2_data_sheet.pdf
    • https://s3.amazonaws.com/sugowubuf/85498985807.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddd.bin
d04039796741d7722bc9c9d49b45d8523c992c0266acab7f7ed0d36ffe020654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 5436 bytes
font_01_sfnt_off0000f03e.bin
74871ace99ea333015e873fbafe7c1124c433a9174078b755e493a29895fc521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10600 bytes
font_02_sfnt_off00011449.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 4324 bytes

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