Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc20e72ad095efd…

MALICIOUS

PDF

72.1 KB Created: 2021-04-11 22:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c6185cc32fc81acbd34dba9503ae7a SHA-1: 8eaa6581e7269baca2d5db8a09e8affa47cf5486 SHA-256: 3dc20e72ad095efd9e06a863a63259a0e37e3dbf51e792a45b03fecbb49e42f1
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to product specifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/strik?utm_term=uppababy+vista+bassinet+specifications
    • https://static.s123-cdn-static.com/uploads/4464077/normal_6008b16468b50.pdf
    • https://cdn-cms.f-static.net/uploads/4368469/normal_605d8e97b105b.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_5fd2d7fae7077.pdf
    • https://static.s123-cdn-static.com/uploads/4370791/normal_5ff50b937d05c.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_6040ed934b9f2.pdf
    • https://static.s123-cdn-static.com/uploads/4454681/normal_600188353682b.pdf
    • https://static.s123-cdn-static.com/uploads/4372399/normal_5fcc534296131.pdf
    • http://woziwowariv.sportsontheweb.net/50786139421.pdf
    • https://cdn-cms.f-static.net/uploads/4384821/normal_603ded14eb901.pdf
    • http://gipogup.sportsontheweb.net/64227671977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gotimovogeminir.myartsonline.com/sikekaramekixewazis.pdf
    • https://s3.amazonaws.com/lebejos/96072324371.pdf
    • https://s3.amazonaws.com/wekibik/reglas_de_acentuacion_agudas_y_graves.pdf
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_c8d8cc8d7f324671a8b2d2721706c795.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_ee93db973e9f441590130b5f5fb318e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d54c8aa-2e04-479a-9a91-a8b44d289f90/38446463178.pdf
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_1c26a45af4124925baa7ab6107b7e632.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf6a9e98-bb01-4b5d-ab44-f64443f155f3/letasoft_sound_booster_keygen_download.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_fbc555a668f04d5f9d56ae401f1acabf.pdf?index=true
    • https://s3.amazonaws.com/wizitifowubux/whats_the_best_pressure_washer_on_the_market.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_off0000dc7d.bin
d24ee1708ab1201d584d1549c478ede126786550ddc15aa17653d0406ad76995		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5176 bytes
font_01_sfnt_off0000ee3e.bin
ad729de13a62d6aa87279ab5ab87bee2d1fc43453a62c14ebe1e643939582058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 10960 bytes

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