Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ab37f2b262ca9b…

MALICIOUS

PDF

76.3 KB Created: 2021-04-19 16:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143f22d54e34b427fc12bd5a86a1b78f SHA-1: 80679f786c0ba3833ca40f4dc19a262709ee2634 SHA-256: 78ab37f2b262ca9b23672960addcf0d450391de6e0dda0b238532866a1f76c61
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which are likely part of a link farm or phishing campaign, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. The embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=thinking+maps+tree+map
    • http://helper-badges.com/xonotufozpcrsj.pdf
    • https://cdn-cms.f-static.net/uploads/4489844/normal_600c80ead921c.pdf
    • https://static.s123-cdn-static.com/uploads/4468551/normal_5fdf63aaae2e6.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_604cd41a54e13.pdf
    • http://amaryllis.space/60978451468mi96c.pdf
    • http://1offpark.xyz/nolugedifobedezizogoromakgzd3v.pdf
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fc9bba45e1e3.pdf
    • https://cdn-cms.f-static.net/uploads/4447251/normal_6035f6993a7f6.pdf
    • http://bigowet.xyz/14876825184nfo2l.pdf
    • http://trenolgia.buzz/what_are_the_five_different_types_of_text_structurewth3v.pdf
    • http://domastmsk.space/vector_spherical_harmonics_matlabjm0su.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://vehicleinsusa.com/71376633754cnklr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4129fe77-0e14-4ab7-b114-3fd4fafda839/the_very_busy_spider_comprehension_questions.pdf
    • https://uploads.strikinglycdn.com/files/795f4479-9755-4134-b579-88ef9d275329/how_to_cook_beginners_guide.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_cad2364cc5274406a94cbbde5cd16a52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/855de937-6157-4920-8822-d733f6967e69/bissell_powerforce_helix_turbo_rewind_bagless_upright_vacuum.pdf
    • https://uploads.strikinglycdn.com/files/4e3f55ba-f703-4fd4-b875-f5f162193f85/77815433847.pdf
    • https://uploads.strikinglycdn.com/files/4afc4711-5dd0-40e2-a7a0-0ec88661c0bd/what_are_the_characteristics_of_systems.pdf
    • https://uploads.strikinglycdn.com/files/4cabc712-ff3a-43d4-8e87-13c7e76f8733/jaledoxuz.pdf
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_249dde1cdb3b46b9a881f8d73a655d04.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_off0000ec0c.bin
2129ee9cb74ddaa15ec38dabdddc58a6092937c7a55dfdb2f958b4af15651d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5216 bytes
font_01_sfnt_off0000fda1.bin
5e15330ba06b93c2213886609c8b9c02cd0e2832b7e8206d81cc496fcec206da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 11248 bytes

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