Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47fffcebefab382…

MALICIOUS

PDF

75.0 KB Created: 2021-04-03 04:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec23d3a78951220333b13016b3e5f313 SHA-1: abb2e866e88e51b48cd18866bf679ebef2036889 SHA-256: c47fffcebefab3823bc7e968e30c0971f2cc7bb41d2758832addda49b831bb7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=elmwood+cemetery+birmingham+map
    • https://cdn.sqhk.co/zosiwutu/ggfcgfm/22521121272.pdf
    • https://cdn.sqhk.co/sadetujadufi/igrLFgi/56734477662.pdf
    • https://cdn.sqhk.co/rufadexu/Kjaiejg/battle_angel_anime_trailer.pdf
    • https://cdn.sqhk.co/laruxibut/ho3m8iY/hobby_lobby_appleton_wi.pdf
    • https://cdn.sqhk.co/falugojafat/ijjfWgc/best_knife_set_with_sharpener.pdf
    • https://cdn.sqhk.co/kopakezoxek/jH0ign4/gejovozasogebod.pdf
    • https://cdn.sqhk.co/wifukatar/wktiihd/ziribobu.pdf
    • https://cdn.sqhk.co/zarepowake/ajiXo71/perfect_strike_wii_bowling.pdf
    • https://cdn.sqhk.co/pekotegafod/hbVgdZ1/63104123851.pdf
    • http://tebogekememesij.mygamesonline.org/hindu_boy_names_starting_with_k.pdf
    • http://kedugobepuged.mywebcommunity.org/foam_block_printing_lesson_plan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30bb9d03-04f1-4043-8ca4-b11f08dd7d37.filesusr.com/ugd/82ab19_dedc399ea48143a2b51e4aad0e76e987.pdf?index=true
    • https://s3.amazonaws.com/nuxepiduded/vapebizesovetesoxozemanem.pdf
    • http://kaxuwenewutexu.myartsonline.com/madolaneriwipapos.pdf
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_a3563dde69a7403aa807b88df0c92386.pdf?index=true
    • https://s3.amazonaws.com/guvovigo/vetajuxetivamubupes.pdf
    • http://tonavisuma.onlinewebshop.net/air_pollution_caused_by_industries.pdf
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_b659b810ccb44b8a9102d7b1007dea26.pdf?index=true
    • https://s3.amazonaws.com/nevovumowa/how_long_to_see_results_from_5_2_diet.pdf
    • https://s3.amazonaws.com/sajezife/farimo.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_off0000e415.bin
cd82b7ccbc994037bfab7028ec31c80954d6bdfb78c15263a3ba531b2a2bbbdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 5600 bytes
font_01_sfnt_off0000f70e.bin
51636aa40e6e1bbcd5377e08def13e8f41e315e0dde656464ddd2863ff302d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 11560 bytes

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