Malicious PDF — malware analysis report

Static analysis result for SHA-256 749e16600c73ea92…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 21:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2158ce83a51d75ec31958929bb2a5f0 SHA-1: d26c00d8ef00f76039b8fe68620ef5a0d27e7c6b SHA-256: 749e16600c73ea92e21fb28aab13632e4555df45532cf543bd716f7583bacc11
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a mass external PDF link farm, with one prominent malicious URL pointing to a potential phishing or malware distribution site. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to test answers, aligning with a phishing or social engineering attack.

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-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://lozipotod.ru/wix?keyword=sejpme+1+post+test+answers
    • http://sivolejujivozul.scienceontheweb.net/mathematics_textbook_for_class_8_chapter_3.pdf
    • http://rikumoturukeju.iblogger.org/xiwisivafewovidikapikuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palikuvexake/old_english_calligraphy_font_free.pdf
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_f48755fa10f242229434081c92997ef5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7020f717-8f2d-4620-ab64-3144d4d282eb/81790790739.pdf
    • http://sobibuxasegisun.rf.gd/70701936149.pdf
    • https://uploads.strikinglycdn.com/files/cbb9c8e2-8413-415f-968f-cb43a93c15b9/explain_how_psychometric_studies_are_used_to_study_cognitive_psychology.pdf
    • https://s3.amazonaws.com/zarevizebi/kezitul.pdf
    • https://s3.amazonaws.com/gafedupeba/aptoide_tv_for_firestick_using_er.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/73213324451.pdf
    • https://uploads.strikinglycdn.com/files/9ba98601-958e-4bd6-b912-9960c833082c/20515274394.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_61a067f7c4894e06b94befe68091c0a7.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_110e47113d0141b2bbacb4db2df14fae.pdf?index=true
    • http://pelapekowom.rf.gd/biology_science_for_life_with_physiology.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_ed55dd13ba704c04b07f69df8743f4e9.pdf?index=true
    • http://vuruwabudakase.epizy.com/latest_aerobics_music_free.pdf
    • https://uploads.strikinglycdn.com/files/fb8e84ff-81da-4145-bbd3-8f34fb5cda2a/pcib_project_management_definition.pdf
    • http://lawiferow.myartsonline.com/design_calculation_of_pressure_vessel.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_off00010093.bin
842fa2630cacbf20d55d403a3ef1ff0ba1942d9e1585d0e019d1a9cb8ac5b65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 5256 bytes
font_01_sfnt_off00011279.bin
b625615f6cde969103b1ccd72913fa1e942e1f5aa059c3d64ce897a62171d137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 10480 bytes

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