Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e5b38f6df375b7…

MALICIOUS

PDF

81.8 KB Created: 2021-04-08 08:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ddf3e8d0558f13afa5fa6b0dfcdd2a3d SHA-1: 2bdd9196de6edebd6b79af1b9be344a1d8cee086 SHA-256: 77e5b38f6df375b707013a7029b3ed66b064fc78376b6248eb916e556284c3d2
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://mezovuduw.ru/123?utm_term=hartwell+lake+fishing+guides PDF link annotation
    • https://cdn.sqhk.co/wixexozesila/mgcFXgd/firudelububejumirusus.pdfIn PDF document text
    • http://stroiline74.ru/69615442563hqydw.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/how_to_write_a_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hbjfpgc/origami_instructions_box_with_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/djjlZEB/13564539197.pdfIn PDF document text
    • http://znakomstva69.space/dinghy_meaning_scottishyi8jb.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/62896127313.pdfIn PDF document text
    • http://interstart.online/ot_word_family_worksheets_for_kindergarten5yjq0.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/1jageje/mame_0._139_u1_full_romset.pdfIn PDF document text
    • http://fabermanufacture.ru/jakitagatowiwiktewc.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/0gf0gde/dovaxo.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://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_8cee5d06f396401d96c67d9f993a78ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/feef10a3-cdd3-4fa2-9399-af7d5efb6eec/fazurorekogusa.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/medical_instrumentation_john_g_webster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b67e86-28e5-4701-a55c-7abd431832a9/76066539578.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/chakkwein_suit_song_free.pdfIn PDF document text
    • http://kapowuxivi.atwebpages.com/86453895519.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_b7235d9dcab34d6ab6b5661fd2329e9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/77562313752.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_52486640861848c8b812e048d056af23.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_e61f31fa60ba4fa493f35b40751249b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df4f902-fa05-4d2e-8c73-03f436450d52/bosch_refrigerator_parts_near_me.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_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 5060 bytes
SHA-256: a525b6945cd22e5bedf501ad2cfd0e7c0455950bdabb2861520986938112a923
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10668 bytes
SHA-256: 32766081dfb2aed1cd1bce3205539ce01a3ce5fca90dcd811127371e1cd92edf
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f