Malicious PDF — malware analysis report

Static analysis result for SHA-256 db12db841c54e005…

MALICIOUS

PDF

103.8 KB Created: 2021-02-28 21:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a294eae34eb50372dbba99934f4dd5ec SHA-1: f9f061bc1c7d14a338d289d044f095415a40a895 SHA-256: db12db841c54e0058ece1de825ec6e7b802c9398bbbb96d726759ac765cb0269
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it functions as a link farm, directing users to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=psychology+define+mental+health+problems PDF link annotation
    • http://wunegaxuduru.22web.org/dageloso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_5fe9003b24dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6034e1d7e7221.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5fcc0765ea21e.pdfIn PDF document text
    • http://devazabekodum.iblogger.org/45159783220.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ijxtI8N/91827684694.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/bPhaPK8/coloring_pages_for_adults.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485299/normal_5ffc99e92c363.pdfIn PDF document text
    • http://nalomojup.22web.org/gangland_season_3_episode_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6018607eb68e5.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/HKehiig/19180561424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimejuj.rf.gd/divanonuwezitukow.pdfIn PDF document text
    • http://tewojaxosu.rf.gd/smadav_free_for_windows_8._1.pdfIn PDF document text
    • http://jiresigotapikeb.rf.gd/present_perfect_tense_esl_worksheet.pdfIn PDF document text
    • http://manomiwivisuf.epizy.com/shallow_easy_piano_sheet_music_free.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/woboge.pdfIn PDF document text
    • http://faputigumajo.rf.gd/xewejabiwipuboxobamuj.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/two_words_are_jumbled_up_puzzle_answers.pdfIn PDF document text
    • http://xakafof.rf.gd/can_divorce_lawyer_subpoena_bank_records.pdfIn PDF document text
    • http://fubobowom.rf.gd/22452293157.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/aqa_a_level_chemistry_oxford_book_answers.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_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 28284 bytes
SHA-256: 87206cdbe70c1249c8453bd835cf0604ea1ac88f98cb0a62cc115c92ca964eb1
font_01_sfnt_off0001550d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550D 5812 bytes
SHA-256: f103869aec4431e5927d09eaa02728e33ccb3bd0ae3d081be9a777806fcc1d48
font_02_sfnt_off000168af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AF 11620 bytes
SHA-256: 5ea4a1224b6ba41355e7bb9739f3658ad23bc6afbb58c4a44ce59e79c9b6489b

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