Malicious PDF — malware analysis report

Static analysis result for SHA-256 795133655282cdc1…

MALICIOUS

PDF

83.2 KB Created: 2021-03-28 04:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7afc3856eb57fcb1e310d3a572bbd5f4 SHA-1: b3590ebaf210b5be7dee85d35e0d0e661d369cda SHA-256: 795133655282cdc1acad113740c917537c484a5124577043c064085492c6126a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=ryobi+2800+psi+pressure+washer+manual PDF link annotation
    • https://selenaza.weebly.com/uploads/1/3/4/8/134878333/8720825.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/79362761702.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/how_to_scan_from_hp_4630_to_computer.pdfIn PDF document text
    • https://molipexizeji.weebly.com/uploads/1/3/4/6/134693273/6694ab0b08e1e.pdfIn PDF document text
    • http://mibewoz.22web.org/wipoj.pdfIn PDF document text
    • http://nemurirewokow.iblogger.org/boss_bengali_full_movie_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://denuvila.rf.gd/adjectives_exercises_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ed7708-b63f-40aa-9f84-455fd10e609a/epson_expression_premium_xp-820_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccb37a4-fad8-44b7-b509-8cc02611f85b/83529109008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0641c049-741d-46d6-a7a5-ce2ee8a1cfa0/japonoboxozaxejetozegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d618165d-d49b-438e-a631-5215fdb73291/speed_queen_washing_machine_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9990eb93-2154-4fa5-a743-a7864c5cb841/heat_exchanger_types_of_flow.pdfIn PDF document text
    • http://lobidirubegevil.epizy.com/bu_jhansi_examination_form_2015-_16.pdfIn PDF document text
    • http://noxumalog.onlinewebshop.net/12588337507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e23c34-c2cc-4401-b616-33ef38a00ffb/45420572797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc7d94c-711a-4730-a83b-2919d317b004/32928907654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed2aa28-a7f3-4c02-9536-776aafb50eb1/what_is_power_dissipation_in_cmos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa25b3a-6159-46de-842e-4bc5d92e769d/punazunididupesituledujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028b6600-0d74-4172-ba14-b0cba41c59e9/93292574904.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 5868 bytes
SHA-256: 90d5d64c18067438189330549f3cf0eb12c2c6654f753a1fd61fced79208deb7
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 11124 bytes
SHA-256: 89d11830adca7328c6aa965be90fa46b7c87865dd6af90ace5aeaef6de9db5fd