Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fa9a9940f78a3d…

MALICIOUS

PDF

68.5 KB Created: 2021-01-21 17:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8c1ff24440bfacf07d1777715c3abbd5 SHA-1: 10004f2d552e34e6e5c7b009f45d819b6a6a596c SHA-256: 28fa9a9940f78a3d52fa65b6174cd22e863cf5f41ccf595e836ee474cae31efe
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=spreadsheet+tools+for+engineers+using+excel+2007+solutions+manual+pdf PDF link annotation
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/b591c3e8b087d58.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jji6xje/asphalt_nitro_for_pc_without_emulator.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/fIhduhc/vugamugowiterixeduruj.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/s6gciUe/on_my_own_les_miserables_sheet_music_free.pdfIn PDF document text
    • https://pokumowudo.weebly.com/uploads/1/3/0/7/130740164/konarijekag.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/b21c1df8.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/agdZhf6/black_magic_little_mix_piano_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/cF1Coic/xinepi.pdfIn PDF document text
    • https://site-1244787.mozfiles.com/files/1244787/fapesevemaje.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/9f7571.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/gfhIhfB/shark_eats_dolphin_lbi_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dewobube/jdEh3gg/supertux_2_windows_7_download.pdfIn PDF document text
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/wizas_vokuluzixeju_punamuzexewulas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedomawof.rf.gd/23258954718.pdfIn PDF document text
    • http://gosovugan.epizy.com/zirufiripafafedamigepew.pdfIn PDF document text
    • http://susupufewowe.epizy.com/whole_new_world_sheet_music_piano.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_off0000c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 2868 bytes
SHA-256: 961dc1380210bdc02715716d6a7e97355048e34260408ad82901b2fe81a5fac4
font_01_sfnt_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 6092 bytes
SHA-256: a7fa3c8d8dc7eee23e208b5014e9cd41819341ae9020636b3800fe47b24a22d7
font_02_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 9636 bytes
SHA-256: 7a6286dc4ae56d28d53a07308311b9834147e93688b51a78d027b06f400bfca5

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