Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d610254bb25230e…

MALICIOUS

PDF

89.4 KB Created: 2021-05-02 15:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fe311fba856d03cc55dcee76aedd647e SHA-1: db81ffc18913930d941de3ea2cf4b5f0c29f4f6b SHA-256: 0d610254bb25230ebe848f02e51289b04e79e8e0c16e8d88933b9bae5a03e8d7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains, many of which are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=hp+6500a+plus+printhead+problem In PDF document text
    • http://gadivawiw.sportsontheweb.net/que_son_las_cadenas_alimenticias.pdfIn PDF document text
    • http://euroshopme.site/chronicle_of_a_death_foretold_audiobook_part_5pzetc.pdfIn PDF document text
    • http://kungfumalibu.com/zowugonugiriwezs06bz.pdfIn PDF document text
    • http://prodive.su/a_canadian_writers_reference_seventh_edition5wfly.pdfIn PDF document text
    • http://gilutij.iblogger.org/mikefesujavumixakudomop.pdfIn PDF document text
    • http://mufadapi.22web.org/notutiboxikomidonalaxagux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_6060f40d46cec.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/aashto_standards.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://secureappeal.com/899002050338kgiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hKoah65/kikkerland_moustache_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/hbibI5K/dancing_on_my_own_roblox_song_id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_604f3772d4de1.pdfIn PDF document text
    • http://subumobo.22web.org/89551949649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_6034964491658.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://s3.amazonaws.com/bofake/widumupeboxivutojimisili.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/44373968622.pdfIn PDF document text
    • http://godanalig.epizy.com/56680578297.pdfIn PDF document text
    • http://rigirulame.epizy.com/educational_printable_worksheets_for_4_year_olds.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/77014055762.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_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 5600 bytes
SHA-256: 56e6d8d677b589dbd817dda9c19e2cec2262c00840c135999727cdbdc5c5c8d0
font_01_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 11284 bytes
SHA-256: 862081cc7e4a7248b7db7af926fdc8a0293d4c6904109ee53b8cba6eabf1f16a
font_02_sfnt_off00014a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A66 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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