Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb4ab2cf80a42c…

MALICIOUS

PDF

75.9 KB Created: 2021-04-09 05:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 400b77232b0bf0e1e420e43fbb5ad2e7 SHA-1: ddfb7ed57d7402a2bebe12b99707689ce87e9629 SHA-256: 73fb4ab2cf80a42cfc9c407d17b4f6cf6df3ee5dd1e9551b7e9b69275c8bf13a
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, flagged as a link farm, and one specific URL is associated with a phishing lure about deleting Google search history. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many external links suggests a redirection mechanism.

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://jumiwimov.ru/strik?utm_term=deleting+google+search+history+on+ipad
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ffd257e59800.pdf
    • https://cdn.sqhk.co/dutimapo/iia4WfE/toefl_test_preparation_kit_2nd_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4424029/normal_600fcd32bd2dc.pdf
    • https://cdn.sqhk.co/potiribuwuf/a2Ggjhj/3381137918.pdf
    • https://cdn.sqhk.co/nupozifulija/iekXLvk/50828521841.pdf
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5ff278941bdd5.pdf
    • https://cdn.sqhk.co/devisofage/rSThfP1/chess_game_online_play.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_2a24a3f8cb4649b7ab382d6c87a32109.pdf?index=true
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_4c1d3f0745dd40f3b9957b52cda56b06.pdf?index=true
    • http://tofalit.myartsonline.com/96058291744.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_1ed9824746a64c6891f82af8588cae7a.pdf?index=true
    • http://bewimovope.epizy.com/mojavisadaborisobuwetawa.pdf
    • http://lexekuduwowig.atwebpages.com/human_psychology_malayalam.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_f8ef798fffc6495bb3779f854032ffef.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_57d89f2ce41f443f9685269f0c8e1d1c.pdf?index=true
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_3406839568c0445eab4b1a0ca83c1c06.pdf?index=true
    • http://merujepapi.epizy.com/speak_your_mind_2_teacher_s_book.pdf
    • http://zonadomafi.rf.gd/divide_fraction_worksheet.pdf
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_1344152979364b3c8ce4bf5111f10601.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_off0000ea80.bin
a911d70ddb712abd972b0c9577bbb5366a3ff29a579f128bc4de85c532cfafd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5436 bytes
font_01_sfnt_off0000fd0a.bin
6b0d02d6b82e80937371bf801fe05cd838bcab979fcf99dab9b443a178adc8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10864 bytes

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