Malicious PDF — malware analysis report

Static analysis result for SHA-256 1198388c23055d1b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-10 12:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 673e39b0ea2a74ace61c84425fd2bfad SHA-1: 895c0116578ead0fd7120d70e0ac587e1e547733 SHA-256: 1198388c23055d1b76294f5f1fa67b34ae65f883c2cb98cd21cc531f21d77e9e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as redirectors, indicating a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

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://druttle.ru/strik?utm_term=the+medium+is+the+message+meaning+tagalog PDF link annotation
    • http://formulamoney.top/foxit_phantompdf_editor_activation_keyo35an.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/Oajjhgr/piganipifumidirukivedilot.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/fY8mXih/early_90s_pop_music_hits.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/E0ieePA/mp3_cutter_and_ringtone_maker_app_download_uptodown.pdfIn PDF document text
    • http://bostpolamos.site/996107333762vja2.pdfIn PDF document text
    • http://opensol.xyz/afternoon_with_irish_cows_poem53gw2.pdfIn PDF document text
    • https://cdn.sqhk.co/dufadafakuti/yqeiiij/tuxevusoxejinex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6024c83f2673f.pdfIn PDF document text
    • http://wegansit.space/financial_modelling_basicskxxdy.pdfIn PDF document text
    • http://creampiepow.club/dutibapho6u.pdfIn PDF document text
    • http://amsidisi.xyz/packed_bed_scrubber_design_calculationg5o85.pdfIn PDF document text
    • http://save50.pro/833119026998ic37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_602997226670b.pdfIn PDF document text
    • http://worldthailand.fun/30148173451veem1.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/ijjgjI8/lesson_plan_template_for_teacher_training.pdfIn PDF document text
    • http://mnogoturov.com/29108308084kh138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronolajume.epizy.com/car_racing_game_for_pc_laptop.pdfIn PDF document text
    • http://bubomixutiw.rf.gd/are_browning_shotguns_still_made_in_belgium.pdfIn PDF document text
    • http://xavapofe.epizy.com/7117826872.pdfIn PDF document text
    • http://zegaruso.rf.gd/2728834139.pdfIn PDF document text
    • http://goxebobepi.epizy.com/14001313634.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_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 5092 bytes
SHA-256: a72bb5bfc3b23f2edae75a9e9f8d8aee103f9469ebd335efad7abb6e416ad3fc
font_01_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 10572 bytes
SHA-256: 7ac2dd6b1ebbc4eba6a20e830bdee17a966b0e9d695cfc83e69ce9a3b4e3fdd8

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