Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa58adaa855164e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-14 10:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67d458381d6cf528834628542d5d906d SHA-1: 56436e656d2561d764823b79c85403ce00b9a689 SHA-256: 8aa58adaa855164e6244862364c10f4077e023d7fc279eb4ddd83871437517ea
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dugedepap.ru/award?keyword=trigeminal+neuralgia+treatment+options+pdf PDF link annotation
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/aaac7dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/Nid97hf/cinemark_peru_plaza_lima_sur_cartelera.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/shhidKN/20378184433.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/jjPPgdx/fold_up_desk_wall.pdfIn PDF document text
    • https://kubinivoboduwu.weebly.com/uploads/1/3/4/6/134601548/luragarip.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/7429877.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/Y96ombA/foxetuzig.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/yjavjh4/kungfu_warrior_apk.pdfIn PDF document text
    • https://sebijulevezokoj.weebly.com/uploads/1/3/4/5/134512917/migabon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_db91c8b97f0b488186608b23b1593037.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_1551bdf6806b4b5991ad462ed051e105.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_37ae112c3ccb4950b56eef112c5a1451.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_fb922b78d35845f8aa1feaecee747c33.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_f7fb218b021a4c3d8e8412f34586335b.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_3c22950174cd418488702db77455006e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bdf5b1-e596-4770-bbdb-6842fd607ce1/dulakonid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616065a6-7783-48a6-a97b-717e623d3afb/44960481539.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_3ff9d7ae6e0d42bf9fa765bd33755691.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/kaniligiv.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/formacion_de_boca_hoy_contra_river.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_731c3df821ab4c43bb5e515e184fd139.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df988557-24ef-44a0-9564-b2ac8c5067f9/5-2_skills_practice_medians_and_altitudes_of_triangles_answers_with_work.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/vibesosagabopu.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_0ac6fc4612324e21b2bcd7425e2a2678.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_43596cc931fd4a23a7ef53e655faee75.pdf?index=trueIn 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_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 5308 bytes
SHA-256: 7f28db1ef65d7a24501ea1b8b83ffb96b4780e91a26da86b5487bae862e4ddc5
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 11208 bytes
SHA-256: fb935943ffd6ffa79411aba5d4a532c1ea42321d7a04e60bca7f5c2e32974c4e