Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71d10e194bda50c…

MALICIOUS

PDF

84.1 KB Created: 2021-03-09 19:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f0b03ddaba0bf0fea0410865a6e4e04 SHA-1: b72870996d65e24ba65b4a503d58a59c56b6e91e SHA-256: a71d10e194bda50ceb2d414c3cc51ff637665c581b0251a1fa418ddff441e191
96 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The embedded URL points to a suspicious domain, likely for a phishing campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to a malicious site, consistent with spearphishing.

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://resalured.ru/award?keyword=kinetics+of+cationic+polymerization+pdf
    • http://nexusisuperat.22web.org/cuantos_centimetros_son_1_25_pulgadas.pdf
    • http://xujimutisep.iblogger.org/how_to_write_a_thesis_statement_middle_school_ppt.pdf
    • https://cdn.sqhk.co/beratinuga/YuTjjr1/40278393791.pdf
    • http://dutipajito.22web.org/humminbird_helix_5_di_gps_g2_manual.pdf
    • https://cdn.sqhk.co/futevanu/ejfHlIe/bullet_force_download_apk_obb.pdf
    • http://waneboto.66ghz.com/39596204942.pdf
    • https://cdn.sqhk.co/gozigawefo/bFsVPYY/53711404077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sesafefanulokam/html5_video_background_template.pdf
    • http://luxafik.epizy.com/captive_prince_volume_2_read_online.pdf
    • https://s3.amazonaws.com/rodigapigeta/final_report_collapse_world_trade_center_towers.pdf
    • https://uploads.strikinglycdn.com/files/0b2a171e-b458-4395-b642-d1b77c85ac84/capitalism_the_unknown_ideal_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/f1ac0fbc-f1af-414a-8efa-9e41b8286854/what_is_theory_of_computation_used_for.pdf
    • https://s3.amazonaws.com/wokesabisevo/critical_thinking_questions_part_1_answers.pdf
    • https://uploads.strikinglycdn.com/files/8d4854c5-2d11-40b4-b4b1-7f124d197e56/how_to_write_a_construction_estimate.pdf
    • http://fagesoletenuku.rf.gd/zosagotaluvakuz.pdf
    • http://sodividupoz.epizy.com/how_to_use_suunto_d4i_dive_computer.pdf
    • https://s3.amazonaws.com/tumuzu/85976705085.pdf
    • https://s3.amazonaws.com/venunamazozuzo/kuvuvera.pdf
    • https://s3.amazonaws.com/gixirojozogufux/yamla_pagla_deewana_video_song_3gp.pdf
    • https://uploads.strikinglycdn.com/files/fe54cb5b-b8cc-466e-b248-00676ad54d3f/67076845756.pdf
    • http://gokakotafabap.rf.gd/48300011380.pdf
    • https://uploads.strikinglycdn.com/files/6e32625b-c2cd-47ea-ad79-495aca677a06/how_to_light_pilot_on_worcester_boiler.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/how_to_catch_a_good_man_and_keep_him.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff91.bin
b384aff6d2f2d405feb0146d3320564e17244348f3c89534ac1cd330b22f410a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 3032 bytes
font_01_sfnt_off00010a16.bin
9018b8c06c427ccd3f7575abfb1168e2a29eeb2ef2cc3635ce04be3d7e361c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 5420 bytes
font_02_sfnt_off00011c88.bin
8139340fc588f011c95b5034952fd7fa0a009115cfeff02497e6dcd0b64d5541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 11028 bytes

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