Malicious PDF — malware analysis report

Static analysis result for SHA-256 083384e6d4c374ec…

MALICIOUS

PDF

82.7 KB Created: 2021-06-01 10:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4d94d7724a04d8c7c6237081726ae73b SHA-1: 6eba5c31ab36da9d66557f13705bf2414aaf37fd SHA-256: 083384e6d4c374ec6abf1b547a3e509bc5e6fc1045171fc7b05b724d370ff069
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The primary URL observed is https://ketchas.ru/pbw?utm_term=cbbe+body+physics+skyrim. No scripts were extracted, but the PDF structure and heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ketchas.ru/pbw?utm_term=cbbe+body+physics+skyrim PDF link annotation
    • https://wisufomerimugil.weebly.com/uploads/1/3/4/0/134016782/2572e379d9c09db.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/1a139ef6f49fad.pdfIn PDF document text
    • https://xebejadeveroj.weebly.com/uploads/1/3/0/9/130969735/f3b32.pdfIn PDF document text
    • https://koxepaje.weebly.com/uploads/1/3/5/3/135350813/4403754.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/b1035563e58044d.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/wibevaxetilogu.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/7242450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/83e53bee-082a-4fb0-a927-dc2423e649fd/wobajikuwevuxebogo.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/area_and_volume_irregular_shapes_using_integration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc47d9c3-7ac7-4869-828d-ca2b345c0e86/gukuzokorizapi.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144418953/44111995979.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144442488/learn_to_speak_arabic_app.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144428682/how_to_end_my_conclusion_paragraph.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428148/how_to_develop_listening_skills_in_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0292fc20-5eed-44d9-8d4b-5573ce7983e8/harbor_breeze_ceiling_fan_parts_capacitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855cf171-384d-4077-8a98-923e79b6cb1d/50045095856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae835b50-9fd7-4a0e-a004-23a968ee75bc/susosurazuzela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bfd85c-e00c-4234-8f3b-105cd10a36bf/structural_engineer_health_and_safety_responsibilities.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/kabhi_khushi_kabhie_gham_movie_mp3_song_download_pagalworld_320kbps.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/perumivamofilukip.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413874/tidun.pdfIn PDF document text
    • http://muxopal.pbworks.com/f/integrated_chinese_lesson_7_dialogue_2_workbook_answers.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144443568/analytical_solid_geometry_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5004 bytes
SHA-256: 6954a31d57e130024a9335e1a84495234cbdeafb4a06f1a019280491f901b498
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 11304 bytes
SHA-256: 7d08c47ce3616a4b2387a4766761892b61b17e3246e3aaf2a09c37d7c9d6b260
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3