Malicious PDF — malware analysis report

Static analysis result for SHA-256 943488bfdc77c1e7…

MALICIOUS

PDF

87.5 KB Created: 2021-05-04 09:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9427fc45c17f424101b09d0a26e8ebc6 SHA-1: fa2d41da7b65ac1a09c9dd303e8573fdfefb0878 SHA-256: 943488bfdc77c1e731c677c325f74fd7e8f7ecc317a0a5248136dd3983cd5d01
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a large number of external links, suggesting a link farm or redirection scheme designed to lead users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to obscure or distribute malicious content through numerous links.

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-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://nipisod.ru/strik?utm_term=standing+stones+ac+valhalla+seahenge
    • https://cdn.sqhk.co/savunowudob/iAkjgja/21943525234.pdf
    • http://busibear.com/794322187661x2mx.pdf
    • https://cdn.sqhk.co/lasokixon/PjgVGvK/school_management_software_php.pdf
    • https://cdn.sqhk.co/tumowara/Goghmxy/caravan_war_heroes_and_tower_defense_mod_apk.pdf
    • http://salonapp.xyz/koketfrwmp.pdf
    • http://nejupike.mygamesonline.org/47445610563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tiluwisulepam/frosty_the_snowman_piano_sheet_music_musescore.pdf
    • https://s3.amazonaws.com/penale/introductory_mathematical_analysis_for_business_economics_and_the_life_and_social_sciences.pdf
    • https://s3.amazonaws.com/piwanisaj/9388406165.pdf
    • https://s3.amazonaws.com/lupebesu/pepoxotegu.pdf
    • http://nujugeteteda.myartsonline.com/68828680103.pdf
    • https://s3.amazonaws.com/wamatasamegu/why_is_my_service_four_wheel_drive_light_on.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b509a23add43465fa1b3b6195a0c100d.pdf?index=true
    • https://s3.amazonaws.com/duzexefemosaxe/xetasoselupafimefowosel.pdf
    • http://wonanikapudidak.atwebpages.com/3145353649.pdf
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_fbebdd38ff9f4dbfa9e9b82be282c096.pdf?index=true
    • https://s3.amazonaws.com/febopa/2014_freightliner_cascadia_owners_manual.pdf
    • https://s3.amazonaws.com/zoxewudunigus/wrist_stretching_exercises.pdf
    • https://s3.amazonaws.com/papuja/64121568726.pdf
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_33639a4404f144e6a8866327c99dc645.pdf?index=true
    • http://tofalit.myartsonline.com/32401457469.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_off0001126a.bin
7d2ade58a8d0d59bf99cbbdedcc1f9a5e23074260773a03178528feaa62b275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 5268 bytes
font_01_sfnt_off0001245d.bin
9b0eb717f37c321a16b026617b716993c7db7373ff947f78deda043add9599d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 14100 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.