Malicious PDF — malware analysis report

Static analysis result for SHA-256 51296a89ba17f157…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 05:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 906251a643956db5a2d21d712a662461 SHA-1: 9798872c40f4f2637ab0f37aa445c857ba7043b3 SHA-256: 51296a89ba17f157cf379ec28a5f425e6537e192b4ea7ecbe76475dbc12b03f6
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic which detected a large number of external links. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=the+real+jazz+fake+book+hal+leonard+pdf, suggesting an attempt to redirect users to a potentially harmful site. The presence of ML and ClamAV detections further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=the+real+jazz+fake+book+hal+leonard+pdf
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/5433337.pdf
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/zamapujegutogu-wobuna-goxazugem.pdf
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/e96c4d78a3.pdf
    • https://zedumolubu.weebly.com/uploads/1/3/4/8/134862080/5174835.pdf
    • https://xukokamil.weebly.com/uploads/1/3/4/3/134317204/fesamadedawifitefare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_456d3d1d1fe54772bdfbce6adee26979.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99118339-760e-4a9c-a318-11ce22e83b77/giwuvizufe.pdf
    • https://uploads.strikinglycdn.com/files/eb79898d-1f06-4ee0-a141-63cd44ea760f/lomilewenamanirirow.pdf
    • https://s3.amazonaws.com/vukujidor/chemical_kinetics_rate_laws_answers.pdf
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_689fa33f8d224fabb54dc50e03813355.pdf?index=true
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_a3e5baa52ad346598d3df4b39d4ba828.pdf?index=true
    • https://s3.amazonaws.com/gorajikunobixi/kofusiguzetikazikif.pdf
    • https://uploads.strikinglycdn.com/files/d210862f-0e61-4f5c-96e6-ecbe8dfaffca/vedasevobatitoxa.pdf
    • https://s3.amazonaws.com/boduxatavepe/garmin_650xi_trainer.pdf
    • https://s3.amazonaws.com/bisiku/angular_formcontrol_select_required.pdf
    • https://s3.amazonaws.com/rodigapigeta/samsung_blockchain_wallet_apk.pdf
    • https://s3.amazonaws.com/folexapurilowe/roramude.pdf
    • https://uploads.strikinglycdn.com/files/afb4436c-f60b-424b-820c-fd120b47116a/vusosawadukuderabofi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08a.bin
771a633c70508fca3108649887248991678f7612342d6a823fbc37168f076343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 5228 bytes
font_01_sfnt_off00010259.bin
074d298391f2f42f4f73754938441d0eac1789f4935a920209769531ef373925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 11088 bytes
font_02_sfnt_off0001282d.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 16120 bytes

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