Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec0a269a99ee2e3…

MALICIOUS

PDF

83.4 KB Created: 2021-03-28 14:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f5cba42092c41c90196419c38be67d SHA-1: 1aa96abb991a54f39015dd9f424fc1807a3a85eb SHA-256: eec0a269a99ee2e34ad03ba0851ea9cc3240ffb4c0d8d88a952efe34782e52be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used in phishing campaigns or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware download.

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://dafemum.ru/strik?utm_term=hp+laserjet+p2035+ink+cartridges
    • https://cdn.sqhk.co/rorefevobo/bsFVVjb/pewewuwovemufowuwironireg.pdf
    • https://cdn.sqhk.co/wepunajexiju/xhaiFii/falling_waters_preserve_trail.pdf
    • https://cdn.sqhk.co/jedelamodafa/jh8hiRq/11021699716.pdf
    • https://cdn.sqhk.co/rajemaramiw/piZhghf/jodaviwajulekadakerol.pdf
    • https://cdn.sqhk.co/xonizarisu/aaje21V/toy_defense_fantasy_tower_defense_game_mod_apk.pdf
    • https://cdn.sqhk.co/xokebuzizo/j9Ty3Fi/67680557826.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/4955913.pdf
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/060957f187eb5c6.pdf
    • https://cdn.sqhk.co/nufesewepi/h0YRhi1/kingdom_hearts_melody_of_memory_price.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_8cb59200b73c4bbf8bab09fbe03696ca.pdf?index=true
    • https://s3.amazonaws.com/perurulexi/travel_blog_template_wordpress.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/49070945771.pdf
    • https://s3.amazonaws.com/faluzotixupi/senior_geotechnical_engineer_position_description.pdf
    • https://s3.amazonaws.com/dinilederu/tewuxinovebabo.pdf
    • https://s3.amazonaws.com/jezobasit/industrial_revolution_worksheet_doc.pdf
    • https://s3.amazonaws.com/lijulijowivaze/the_vamps_oh_cecilia.pdf
    • https://s3.amazonaws.com/mefadedosuw/google_ads_editor_template.pdf
    • https://s3.amazonaws.com/wamatasamegu/how_to_use_dsc_alarm.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_0280128c5bb44bd4bb06ed28d64d8bca.pdf?index=true
    • https://s3.amazonaws.com/vovopafubipu/honda_hrv_guide_auto.pdf
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_5afbd0beaeef485aa8e6262b89a105cd.pdf?index=true
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_956117744d1f41b4a4aa6fb43b452ce5.pdf?index=true
    • 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_off00010600.bin
d58830bcba767540ae9ee8ec5f22d38ce4e4a5827ad46d1a3f84298461d6cef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 5904 bytes
font_01_sfnt_off00011a28.bin
efcdb00d7a1e246b5a0919aa8b266bfdaec5f8a3be2a267c1971247069f1fb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 11172 bytes

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