Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce4c9805dbf373f…

MALICIOUS

PDF

94.0 KB Created: 2021-05-30 15:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b37206de3f79a05c0905650185044e5 SHA-1: 128bca47f3a989b0c757d5847fb1a91fd63aeb90 SHA-256: dce4c9805dbf373fe9a3380ca24cc57a827cabb96c70a39f15f9ac0439e0ee2b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=8+ball+pool+unlimited+guidelines+ios PDF link annotation
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/8820166.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/6595602.pdfIn PDF document text
    • https://lopuradusat.weebly.com/uploads/1/3/5/2/135297354/xijavofi_dasoredazu_sotubaxepibu.pdfIn PDF document text
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/dazowawovozup.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/vezumited_digijudotud_roraduvaga.pdfIn PDF document text
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/bogujeje.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/8459464.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/9b43f232b7cf22.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/72cb0082-0516-4b48-8bc3-2733e4be1da0/saxawip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ef0cc2-eb7e-40ad-9d42-e0e6827d896b/how_do_i_know_if_my_ds_lite_is_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d73674-3b1e-472a-b87f-a2aac70ae922/indesign_book_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22098da-feae-4ee1-867b-95226248e31c/55935803047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736dd9c7-4a90-42b2-a043-da898973c188/fifty_shades_of_darker_mp3_songs_free_download_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b473e3-9098-488a-bbc3-05e0841bdaa2/vikanugapubulegosinowow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8839de-ae3f-4fda-9905-0e2db70d64eb/85715471129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f85cf3-5ff9-4ec4-9586-5b5fd619d8c8/40953354045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bd2e80-dcc6-446b-9fa4-0f7e893a5a55/wiwotixezebej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d083101-c0af-45ab-bb3b-e837529f362a/gasopunemoxena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3a2d54-3ab0-46e9-a9bd-c412f3a7a801/ejercicios_resueltos_de_matematicas_2_eso_ecuaciones_de_primer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50714e5d-8d83-4ebb-8af9-ac796146b1df/intermediate_algebra_functions__authentic_applications_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722b2201-269f-4ff1-b797-873abca2f7b1/how_to_add_mendeley_to_safari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304a3ac6-e217-4535-9657-b5114b63876e/how_to_make_cadmium_yellow_medium.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_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 5424 bytes
SHA-256: e8f932b26b6a1d8a4ecb72d245951b629b837cf1b0317696c8c7f1e6e9828efe
font_01_sfnt_off00013f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 12588 bytes
SHA-256: c1be4dd8a44a561cc03bd4ed3183e4f7a78a958f36f8142edefcca3c248cab61