Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43e6f936d0ae7bb…

MALICIOUS

PDF

84.0 KB Created: 2021-04-10 13:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e72dbe7025889236df33487ce06c4ab SHA-1: accd7ee5ad6774da0bde09d71bb8c090c90b270d SHA-256: a43e6f936d0ae7bb1cf7a95e10924eee1324e6b77070497e39bc96ca1aac08bd
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 a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many of which are obfuscated or point to potentially malicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to external sites for malicious purposes.

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://botokaw.ru/strik?utm_term=the+island+of+doctor+moreau+1977
    • http://helpcreditscore.info/53150918068kxs3n.pdf
    • http://acgmgroup.ru/islanders_roster_tonightvkelr.pdf
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/bebirave.pdf
    • https://cdn.sqhk.co/rajemaramiw/jjiibgc/oreo_milkshake_recipe_without_milk.pdf
    • https://cdn.sqhk.co/xoberuweri/jitifjh/gilewoleni.pdf
    • https://cdn.sqhk.co/suwapipejob/jg2FVja/samsung_level_app_ios_download.pdf
    • https://resodapiperuxa.weebly.com/uploads/1/3/1/4/131407292/3935990.pdf
    • https://cdn.sqhk.co/jivonaxadu/gg7gf3D/4823485445.pdf
    • https://cdn.sqhk.co/zufutetuwume/gjihhhb/dirt_bike_racing_clothes.pdf
    • http://itali-big.space/runurobuzf2him.pdf
    • https://cdn.sqhk.co/jamolipa/gdq8lha/mitixilalixogovegizinur.pdf
    • https://cdn.sqhk.co/vixuzemabad/3ienhgu/stampede_blu_ray_release.pdf
    • http://centerverifybadge.com/83682948747al6qc.pdf
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/8519469.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_46b0039d19134759a5ec882d63257813.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d83da6e7-c000-41e2-a4be-2f6eeb7d1c74/29511954804.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_556f14c32c314717b11bb65811d11afb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0be20100-7159-41a7-95ac-973a8cf3b148/bear_cruzer_bow_package.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_off0001078f.bin
66dcd6b3002e52b8b1f626a5662657bfd7ca3dae4ba78a9b2afcf723d2413896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 5500 bytes
font_01_sfnt_off00011a21.bin
3378cbd1ff9eb1cfdb554e4c10caf3fe9a5481f42ecde0f26ea2ebb1c99f5978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 11456 bytes

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