Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3228ca4d696b03…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 03:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3dc7bbf3ea2d7e32286293ee1e1d69bd SHA-1: bab808a99c15803c7cc80e6032c44744a1082751 SHA-256: 9f3228ca4d696b036765497909e427df3831ca4670bab5fe7c7fd0f194056d9b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=administra%25C3%25A7%25C3%25A3o+de+marketing+las+casas+pdf PDF link annotation
    • http://sesizuxewewax.mygamesonline.org/can_we_read_books_in_kindle.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/zatotapaminovutovuvidu.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/b94f4def.pdfIn PDF document text
    • http://prizinsta24.site/can_and_could_for_requests_exercisesf9tek.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/do_chrysanthemums_self_seed.pdfIn PDF document text
    • http://voztrans.ru/haas_machinists_cnc_reference_guide2dy0y.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/samozelefujiw.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/arms_reach_co_sleeper_versatile_bassinet_weight_limit.pdfIn PDF document text
    • https://pidesetax.weebly.com/uploads/1/3/0/7/130739971/tixixazazusepajefivi.pdfIn PDF document text
    • https://mepaxojapukofu.weebly.com/uploads/1/3/4/6/134609152/6f24601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df70707-a5b8-47c0-86d1-cd0547b69363/xokoxezezabulozuxew.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/how_to_setup_your_roku_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66d9c90-269e-445f-8639-4f73fd32234f/maggianos_reheat_instructions_frozen_lasagna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7817eedd-1192-4cad-9452-8a47cb93119c/how_to_put_line_on_abu_garcia_baitcaster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541b6872-4259-48f7-995b-2b53c219a757/98418767389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758e82bf-f6a9-4722-9cb5-127ae8b16f14/book_of_jasher_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b2caa7-9e0e-4fa1-a508-e31220702e01/rudunozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79625868-64d0-4518-bea3-eea020a138b6/zejitejogik.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/lookup_array_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/al_quran_dan_terjemahan_indonesia_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f26123-f94f-436d-85f8-b8ba5b9c3e55/motonegapara.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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 6028 bytes
SHA-256: 984c1c64d2a6a95e71a98656296e797e29aa91d044376cd8e13f9f80e6125c65
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10668 bytes
SHA-256: 2602739f04e607a72eb13d6dfbdbab51cae358cf474d563aeb795d05816a775a