Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3b5bb1bb5bf807…

MALICIOUS

PDF

78.9 KB Created: 2021-04-19 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab0b10e8eb0ae282deca92c2cb7b83a SHA-1: e4260921e735f09f320058cfb377ebf5f68bead3 SHA-256: 4a3b5bb1bb5bf8072c1a76c5166e59368c66b7a4a0486cecbb588129e633e116
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 leads to a domain known for hosting malicious content, likely intended to trick users into visiting it. The document body, though heavily obfuscated, appears to contain keywords related to engine information, suggesting a pretext for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=briggs+and+stratton+vanguard+engine+number+location
    • http://lessonsonline.site/how_long_do_you_rotisserie_a_chicken_in_an_air_fryers98zv.pdf
    • http://otomail.business/vermont_castings_radiance_rdvod_manualxlkqs.pdf
    • https://cdn.sqhk.co/jozojonujaj/D4hcjcV/3834933961.pdf
    • https://cdn.sqhk.co/noretokujazo/hhPBSjh/canon_printer_driver_lbp6030b.pdf
    • https://cdn.sqhk.co/zexoribuj/bMgigU1/34761153879.pdf
    • http://natnat.fun/sunoten8r2f.pdf
    • https://cdn.sqhk.co/velomegu/fVgfDgj/teribatonamaseweweg.pdf
    • http://golden-bridge.pro/4868416264a3wkd.pdf
    • http://nature-ital.space/406774325602hls6.pdf
    • http://hurricane1.space/brief_adherence_rating_scalejynyy.pdf
    • https://cdn.sqhk.co/losiluja/hjjbeC8/wajal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tujeviwakirawu/santa_clara_pueblo_v._martinez_oyez.pdf
    • https://uploads.strikinglycdn.com/files/e54f8b77-3f11-4a85-933e-5449d8185107/zefebokujejovawibog.pdf
    • https://uploads.strikinglycdn.com/files/3f99160b-b347-4ab3-8c09-6036b5009345/wepakerusuti.pdf
    • https://s3.amazonaws.com/voropa/roblox_aimbot_2018_phantom_forces.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/kureromorebel.pdf
    • https://s3.amazonaws.com/wiremeresegikon/96849115739.pdf
    • https://uploads.strikinglycdn.com/files/14fd4b64-ee0f-4b47-9e1d-47fc0d5abdb8/12160225978.pdf
    • https://uploads.strikinglycdn.com/files/95274d19-c019-47f5-9d09-307894c873ec/bilulit.pdf
    • https://uploads.strikinglycdn.com/files/cc749ffb-3e6a-42a6-bb89-1900db4b342c/kali_linux_commands_list_in_hindi.pdf
    • https://s3.amazonaws.com/lunojol/juwekuvekazi.pdf
    • https://s3.amazonaws.com/bulikowexunepov/lukobureb.pdf
    • https://s3.amazonaws.com/rurovikejigibu/how_to_work_out_the_volume_of_a_cuboid.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_off0000f518.bin
b690e9ab1e807b5cb34cc1a585c9d1fbbb425759e2da35f627e6541377d429c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 5508 bytes
font_01_sfnt_off000107c4.bin
93ed6964be3f4e8205557e0da2d4380b9cf5ae20adce5f54d8af3f87871a55e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 11008 bytes

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