Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d73697adfc5cdf3…

MALICIOUS

PDF

125.3 KB Created: 2021-05-03 21:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c954cbb799fd4d6425c2a73598eb1c SHA-1: d563d7b6f3cf931ba5032f8c4aadfec3ca257480 SHA-256: 3d73697adfc5cdf3906f9b48057259f5a5749a122dcebc036f4e341ab5eaf3c7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

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://xezojetit.ru/strik?utm_term=the+importance+of+being+earnest+play+review
    • http://mekujoviwe.mypressonline.com/79161006308.pdf
    • http://bipowilago.mywebcommunity.org/5343997411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_7bf2082e7bb445538ece14d200de1a04.pdf?index=true
    • http://dudijujixafag.rf.gd/bilekijiropelovizoveze.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_6c7b8120c434476fae0520d34e1ec350.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_1758662bb03f484bbc004f57cc12e05c.pdf?index=true
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_65b6fa9fbe4a423482791a2ca687c5fc.pdf?index=true
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_b0cd6b401ade4dbdaf0e9b8c4370b89c.pdf?index=true
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_e555cbfd87404da99d7cb40a755301d2.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_53ba86d2719743f8bd2f4b561f794ab0.pdf?index=true
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_f26fa637565341a3b86f8ef9ea20fc13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ab164c3-62b4-44eb-9a01-5204c7f8e5ba/zikeburuzikum.pdf
    • https://uploads.strikinglycdn.com/files/a8305e2f-0a17-4847-9042-0ea2cbba38ba/wapidorulipasotise.pdf
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_a3a7be28d51b4254b677de6f7718681d.pdf?index=true
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_abbab9bd800d4a4bafc6387d2610fc11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/80ab1b7c-cf36-422c-bac7-570d0b915a37/what_is_the_freudian_theory_of_dreams.pdf
    • http://kojusefum.rf.gd/crown_ce1000_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/aa5d1aac-3aff-4d2a-8d6e-fc66eb8577ad/cursos_de_ingles_basico_gratis.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_off0001ac3d.bin
97b00b92434d2713426f2d540b913c4e26d561434d7c33e4a810f6f4b0118dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC3D 5772 bytes
font_01_sfnt_off0001bfcc.bin
3f131122bfd9d5839e7ae34d97942970b86d42ca0fbd802d8be5e0da72f46ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFCC 11872 bytes

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