Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f2478e70705581…

MALICIOUS

PDF

83.9 KB Created: 2021-04-20 03:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b3503368b36c0b86ec87c6a55ae23583 SHA-1: 92fa33ea00bc515300f13c20cd7945da510cd5ef SHA-256: c7f2478e7070558152769a58b2edbbb85ef8f2e4408ae73e852cd43040ece28e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to common technical support queries, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=why+is+my+wifi+not+working+on+my+samsung+tv PDF link annotation
    • http://nudistoff.club/sanuvipirinaguwhxm3j.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/fafevodinebanemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60159e7f0f766.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/5347471259.pdfIn PDF document text
    • http://cz-nitrof.website/marksheet_format_in_ms_word4v2j5.pdfIn PDF document text
    • http://interstart.online/76937873821eabee.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/vexusudajisexuwoxub.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/3864842156.pdfIn PDF document text
    • http://botefin.medianewsonline.com/potusijisusekola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_6055ac72266ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dddf571d-78ae-4ae1-8b92-d39b76ddcf20/how_to_talk_about_protests_at_work.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/4615064029.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/bosonoga_kraljica.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/pronouns_worksheet_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/54774263837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2d4c30-2eca-4030-b230-2681c9c8e687/webinar_autocad_civil_3d_2019_download.pdfIn PDF document text
    • http://lutepotazor.onlinewebshop.net/54821604198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30eea028-54a5-416a-9bd0-55adb931ec7a/what_to_start_drawing_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777e8a75-47b6-4053-9c6b-b1bcede0ca16/famous_lines_from_a_river_runs_through_it.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/agile_testing_lisa_crispin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc9f1a7-6ef9-431c-9b94-7fbad5b6bad5/81698987766.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/88645854949.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_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 5480 bytes
SHA-256: 790f6e996ffc5aa3d73bafdc8911cfa03a2e26bdcdb1785c27c23b4196570fe5
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 11120 bytes
SHA-256: 187e519f5889afcf2ed50a7b44526039c461c80ac55b28f752772b32149fc7d6

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