Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb9db94bccccb88…

MALICIOUS

PDF

82.3 KB Created: 2021-05-08 15:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6fefad05bbe76d9d8572e3067acb4e0f SHA-1: eb79a5ae0eb271dccf9cb63201b9b0aae38aeaa8 SHA-256: 4eb9db94bccccb887b8dad99cc6a770b42c614bc8c6210d4b6a3af7776f97d71
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://leonvi.ru/strik?utm_term=english+vocabulary+in+use', is likely part of this scheme. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/strik?utm_term=english+vocabulary+in+use PDF link annotation
    • http://didegarop.22web.org/pusunezolujafeje.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/8ggdVgc/winter_wardrobe_ideas_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/hoicrfA/business_standard_newspaper_subscription_price.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/ysgdw6e/dungeon_keeper_gold_download.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/sir_gawain_and_the_green_knight_summary_part_1_and_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/pSq8lMB/42555041317.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/fKificr/fikoxuwad.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/adyashanti_jesus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_ad4d9293d9f744dc90f0d31e4fed78c1.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_cd3f763a32644fbaacab8c5e165a6451.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_3e1333f774a444e0a874d043e4504438.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/rozigalexekuzibojapa.pdfIn PDF document text
    • http://nelisusopa.epizy.com/adoption_papers_uk.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_be31aadc91ba4d059244506f4f54c4be.pdf?index=trueIn PDF document text
    • http://wagopof.epizy.com/vetema.pdfIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_ece024d5e6c1420195492bf9a7f8ee9a.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_363e1889f3434949bcb8290e4553cc1e.pdf?index=trueIn PDF document text
    • http://kefujamulewim.epizy.com/dawipifefodoxobol.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_d122ee471cc8426c81aeac8e0cc6968d.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_dec9370acdb7479ca52a881c90b1af00.pdf?index=trueIn PDF document text
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_b88a57ce459f45c89e8e63084f475d6c.pdf?index=trueIn PDF document text
    • http://botamokawafaj.epizy.com/64299731092.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_00d6aed3dbf248559ad2beeb7f87fd1d.pdf?index=trueIn 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_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 5320 bytes
SHA-256: 4ae943e697fa9e99faa902e8e277d37e2cc837e12f9b603375b5d849c35f7108
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 11180 bytes
SHA-256: df0783477b126a017d895047b5d8909f977e92a6b8fcf4e389d5ff1083fb5f72

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