Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e350bcf31e1f46…

MALICIOUS

PDF

74.8 KB Created: 2021-03-25 13:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbeedf6abb57eea032c558f40930dce2 SHA-1: 76ca1c252241b877fb6ce6492ed1a18b4c068499 SHA-256: 06e350bcf31e1f460b7e6315c0ddfe84d66790209022dce5b8c761e615f124dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with one prominent URL being https://nipisod.ru/wix?keyword=formal+charge+worksheet+doc. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'formal charge worksheet'. The presence of embedded URLs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-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://nipisod.ru/wix?keyword=formal+charge+worksheet+doc
    • https://ranezilipevag.weebly.com/uploads/1/3/5/3/135392607/3d55a355afe5e.pdf
    • https://cdn.sqhk.co/madagijoj/dgcjgic/feisty_pets_unicorn_argos.pdf
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/8962012.pdf
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/norabiw_satow.pdf
    • https://cdn.sqhk.co/sewadokoka/ArmyQhd/73174139812.pdf
    • https://cdn.sqhk.co/zufuxirap/hfhaqib/bumik.pdf
    • https://cdn.sqhk.co/mevexobuzur/zifgfOM/screen_guide_parental_control.pdf
    • https://cdn.sqhk.co/jagapifa/eLEiejh/4855850581.pdf
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/b7508c7224f04e2.pdf
    • https://cdn.sqhk.co/komajekolino/72paWia/5898044759.pdf
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/3470c.pdf
    • https://cdn.sqhk.co/kigoxeni/iaMR5cY/ghsa_basketball_championship_2020_live_stream.pdf
    • https://cdn.sqhk.co/fudamozomeb/itjc9hc/ratexitamafedidikogejan.pdf
    • http://panuxidoku.22web.org/25065951833.pdf
    • https://cdn.sqhk.co/nosimasiv/gvhagit/25621067400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rorijurizugetol.epizy.com/short_story_for_kids_printable.pdf
    • https://s3.amazonaws.com/fidobakipivogit/alphabet_francais_majuscule.pdf
    • https://uploads.strikinglycdn.com/files/ffa856ec-ec20-45f4-b425-eda360165bb5/89726754973.pdf
    • https://uploads.strikinglycdn.com/files/78f8139c-d757-4d52-b76e-5e29edbfb9a1/hoveround_mpv5_not_charging.pdf
    • https://uploads.strikinglycdn.com/files/62da950d-faf0-4a61-baaa-7fc431c9bd6f/tufagixevozina.pdf
    • http://sejedusodumevu.epizy.com/71154100457.pdf
    • https://uploads.strikinglycdn.com/files/1bdb6621-aecb-4bd4-9b6a-f06061c6aada/should_i_recycle_paper_plates.pdf
    • https://uploads.strikinglycdn.com/files/85970c41-c309-41a9-ba6e-dc451e2f3049/jefapalopofawebozobiwuvuz.pdf
    • https://s3.amazonaws.com/gogoxowiniza/fisher__paykel_counter-depth_refrigerator_rf201acusx1_-_3_999.pdf
    • https://s3.amazonaws.com/borokegujuzero/massachusetts_driver_s_permit_test_study_guide.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_off0000da0a.bin
bd8439f43b462206bda2d38616b57703a4255f3b24eaf0feddcf491842f17a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 5096 bytes
font_01_sfnt_off0000eb6f.bin
e06524618d52e3907d44eda20fd818b1a02ea955973e36c0f9ebf99da920a894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10612 bytes
font_02_sfnt_off00010f6a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 4324 bytes

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