Malicious PDF — malware analysis report

Static analysis result for SHA-256 812e5868e9639445…

MALICIOUS

PDF

82.0 KB Created: 2021-03-28 06:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2f691f692136b0e4a7ce3b0d176320f3 SHA-1: 238d17b06c80b8396132344a08c3d2156039744c SHA-256: 812e5868e96394458703f3eedc2d167cb717f6351c1bba404ccc0fc419ac9371
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wb?keyword=what%20questions%20are%20on%20the%20moca%20test PDF link annotation
    • http://clobuss.ru/debt_recovery_letter_template_ukp3mog.pdfIn PDF document text
    • http://coins24h.com/fashion_beauty_shampooqatid.pdfIn PDF document text
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/korisuxexaw-bodiwo-wimofujavav-fisagobas.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/manemililajurexizada.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/the_blind_assassin_essay_topics.pdfIn PDF document text
    • http://hopecommunitynaz.com/plc_scada_lab_manualyynfm.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/3005192.pdfIn PDF document text
    • http://wowitaly.space/gejosuxedijetenudofuzejuw0e83y.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/6457a4b.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/agro_ecological_zones_in_ghana.pdfIn PDF document text
    • http://venira.su/cisco_sg200-26fp_manualfbm76.pdfIn PDF document text
    • https://rotisozag.weebly.com/uploads/1/3/4/6/134679288/rojekagikufu.pdfIn PDF document text
    • http://momsmall.space/double_guns_of_nashvillels0r7.pdfIn PDF document text
    • http://belofakomag.mywebcommunity.org/toefl_academic_reading_passages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://puligop.epizy.com/instagram_app_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dc9f68-b909-4a20-acc1-ca5e296af066/how_does_the_2008_ford_escape_hybrid_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601ad220-26ee-4939-a422-6d87588840cb/53043711984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0feef53a-3f80-4bd5-aa85-6486354d1cbc/top_books_to_read_before_law_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca618b13-02ef-490f-aaa6-ffe3358407bc/40310844574.pdfIn PDF document text
    • http://renawexit.epizy.com/zidemapuzibitapitevume.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_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 5028 bytes
SHA-256: ca19b1bf12c5c06de981d194548c423abd3025aea6b9fc77bef66dad0eb35711
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10820 bytes
SHA-256: f7167980c945183e1814f4679cce0e6e82315ed046ef6e6d78e537871a5472ac
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3