Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd19203a34cb282…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 17:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32a0ab62bedfe122ae08868451bd102f SHA-1: f626fcf258ef41c73531e2175924412734760b69 SHA-256: acd19203a34cb2821290f2e9a5bdbefab5a7a4a451de75f391752abc3abf5560
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or to deliver further payloads.

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://ponafet.ru/strik?utm_term=how+many+real+estate+agents+does+keller+williams+have PDF link annotation
    • http://kogutojoveso.mywebcommunity.org/how_do_atoms_form_covalent_bonds.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/which_cuisinart_air_fryer_is_the_best.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/lenovo_t430_display_drivers_for_windows_10_64_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/qjgejjX/space_jam_2_jersey_lebron.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/9Smjbjc/31753744907.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/48771061669.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/JMheheo/bakekewegobuporisokej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luralopanatu.rf.gd/67043962704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a970b4-c93b-410c-a33d-4087816a1dfd/how_to_cook_quinoa_in_tiger_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e83de2-5e26-4a76-a6c4-c122dc46d9cb/binidazuxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5243f919-a130-41b5-ae69-7bcd12f566f0/delegukiza.pdfIn PDF document text
    • http://bitines.myartsonline.com/74661522995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be1e1cf-9e7b-4e1c-bfe6-76ec20597dbd/47050157532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9361b33-ac20-4d96-8d02-87790039601d/dijetapedinugoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cb97b3-321c-4a45-8b79-2e73c8e16cd8/702388524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a93a449-9b48-481a-b029-735f7356448a/sims_4_patch_notes_september_2019.pdfIn PDF document text
    • http://rukubas.epizy.com/the_stand_miniseries_1994_cast.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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5520 bytes
SHA-256: b436dbb0db2a8eedb412282eb446d098a429b3db93bca808e322c1f04b151d1a
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 11272 bytes
SHA-256: 692abd9c75059d05425772869ae48aaf50dd6be23560a9d4905e8c5288da1768

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