Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5390010dac31bf…

MALICIOUS

PDF

89.0 KB Created: 2021-06-03 03:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100e8a436a369d394ef35c73a3f76fe4 SHA-1: 79d1085482e5101f7d238ef51aeaffc095464ea6 SHA-256: cf5390010dac31bf2342e49fd96c93acbd5ec5c7774931054fd6268653218cda
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that mimics a search result, likely intended to trick the user into visiting a malicious site. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/pbw?utm_term=what+fat+burner+is+used+at+tropical+smoothie
    • https://rakovarirol.weebly.com/uploads/1/3/4/4/134458111/23e0916.pdf
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5ff3c78eee68d.pdf
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5fea21e90a505.pdf
    • https://cdn-cms.f-static.net/uploads/4444623/normal_602dcbd1042da.pdf
    • https://cdn-cms.f-static.net/uploads/4417129/normal_600ada22a178a.pdf
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5ff14ccf6480a.pdf
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fe38fd9be9e7.pdf
    • https://cdn-cms.f-static.net/uploads/4420924/normal_603c4c4a46a57.pdf
    • https://static.s123-cdn-static.com/uploads/4456712/normal_5ff77564d8b94.pdf
    • https://cdn-cms.f-static.net/uploads/4503279/normal_606b43748fa3a.pdf
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5fecee68d2659.pdf
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/poranupizokuwot.pdf
    • https://cdn-cms.f-static.net/uploads/4443804/normal_602cf955cf69a.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/3477453.pdf
    • https://static.s123-cdn-static.com/uploads/4473410/normal_60072dd4a8a52.pdf
    • https://pilopumif.weebly.com/uploads/1/3/4/7/134733378/lirurir-rafod-megirudepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jolunatimavu.pbworks.com/w/file/fetch/144504423/xopino.pdf
    • http://xugilip.pbworks.com/f/stickman_the_flash_mod_apk_all_unlocked.pdf
    • https://uploads.strikinglycdn.com/files/d122473d-7769-407d-be8c-9e725612b2ea/how_to_connect_audio_out_from_samsung_led_tv.pdf
    • http://sijomirurefi.pbworks.com/w/file/fetch/144451791/64805693015.pdf
    • http://fubajulak.pbworks.com/w/file/fetch/144426567/skyrim_paradise_halls_reborn.pdf
    • https://uploads.strikinglycdn.com/files/2b65b5d8-6389-401f-ac84-98bc9a2f6500/how_to_program_cuisinart_ss-15.pdf
    • http://gazoridixilu.pbworks.com/w/file/fetch/144509298/gikakatag.pdf
    • https://uploads.strikinglycdn.com/files/40a2dfbd-9d7d-43c2-8c18-907b5e8cd963/pajutifebemisaxuwewib.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_off00011c18.bin
13eeb3da50c655d5b9bd933f632234342fa3a44505cba25f9d324977aed9335a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 5548 bytes
font_01_sfnt_off00012ed5.bin
55a3326c688351cd2d1977f8e11c8bf89b0181b82409008d0543ef950f13741d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 11628 bytes

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