Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d9c0b8905672cf…

MALICIOUS

PDF

77.2 KB Created: 2021-03-28 20:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9d5007629cf8e02984f1e3011a9a16 SHA-1: 8a20aa5019f4db0accb7b3477fc9e7584011d102 SHA-256: e4d9c0b8905672cfd921340bbd030eb250b0e54693a8cc717b40d599818f8a3a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme to malicious sites. The embedded content, though heavily obfuscated, likely serves to disguise the malicious intent and facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-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.
  • 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=birthday+party+veg+food+items+list+indian
    • http://gevenukodujojov.getenjoyment.net/lasopusemisimuned.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd61008c8b18.pdf
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/1885b47a52de.pdf
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/pugujus.pdf
    • http://tideboweped.medianewsonline.com/gupagakal.pdf
    • https://static.s123-cdn-static.com/uploads/4447108/normal_6004be4b56504.pdf
    • https://static.s123-cdn-static.com/uploads/4483337/normal_5ffc56b93bdf1.pdf
    • http://suzamajotibe.mywebcommunity.org/wildgame_innovations_cellular_trail_camera_reviews.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/5411909.pdf
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/9390384.pdf
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/pafopikosigopezun.pdf
    • http://jovopomutulilo.medianewsonline.com/zitifunonetomudaruvatu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_b88d916e03c1468483c7be26561876f1.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_cab7cacf69ce44f99cb95a162037afd7.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_c017f8bc4b3845588d07b177ff490c61.pdf?index=true
    • http://jujobope.atwebpages.com/vutidoluzesifozaf.pdf
    • http://kipazafar.atwebpages.com/26067235141.pdf
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_c24f9f4e1402455a8115a6bf74447ad2.pdf?index=true
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_1e36d1b185334c538fa1feb2d0268cca.pdf?index=true
    • http://zonatitusajobo.onlinewebshop.net/73716383454.pdf
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_571c479914b0426f8ec775f55aeb68d4.pdf?index=true
    • http://wutesejib.onlinewebshop.net/manug.pdf
    • http://bavotuvezomevi.myartsonline.com/are_the_infrared_heaters_worth_it.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeae.bin
2070b2b94d1ace8d923f3263e3b11d5f6c2c9e4d962817aa0259b6b2da328d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 5668 bytes
font_01_sfnt_off000101e2.bin
b8d04332e8f32578caf584dc8283c39f290cff2fa5c85838632f9bd569555078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11060 bytes

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