Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61ca17885b815d0…

MALICIOUS

PDF

90.5 KB Created: 2021-03-31 08:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c88245715d39a16c7b0fa3848c85b0c2 SHA-1: 12924e36b6a48afb0f74e8e5dd3a17eb466e85d4 SHA-256: a61ca17885b815d0252a36c879205da99765049726d7f8c815ad03e58706c15e
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 0.9992

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://soxebez.ru/award?keyword=analytical+reasoning+sample+test+pdf PDF link annotation
    • https://cdn.sqhk.co/zasemewiti/ihcQtif/lupazogasijawaditu.pdfIn PDF document text
    • https://tulelamesesixe.weebly.com/uploads/1/3/5/3/135321102/zitadanata-zulalekis.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/emwjeje/offline_poker_games_for_pc_free_download.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/f6c0d3b8c.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/e832a8bf60ff5.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/cLidE1p/boom_beach_hack_game.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/034303d5121.pdfIn PDF document text
    • https://bapajoronugenig.weebly.com/uploads/1/3/4/2/134234589/1046083.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/UAzgeYI/llamacuba_combo_de_alimentos.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/zidipexukufu_vidokuvugo.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/diHWTUP/97940071292.pdfIn PDF document text
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/635b7a.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/15a97cee-cd8c-4c68-87d7-1d096dc4f847/tortilla_flats_restaurant_soquel.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_9bf2bf30ce044104b84b98c0a2521b2c.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_fc78c819edfa406d87bc162daaad93f5.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_ba644672f5f74078abd060eab5487780.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe942d8b-bfd5-4134-b275-717e56d6be44/how_to_get_dunkin_donuts_delivered.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_7a84789f953a4f429136261de417f15a.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_6ea1dd695cce421bb3b3260f87dbdfc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51a6ade-33eb-4e76-a603-ea8dad3b9d82/mecanica_vectorial_para_ingenieros_estatica_12_edicion_hibbeler.pdfIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_cdb38286e16a4eb989a5968aa5deed22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf447147-fa02-4ce7-bc96-895e0355211f/how_to_use_epsom_salt_to_draw_out_splinter.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_95c78ecdbefc42fc9677acb4de3c5b06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f2efce-759d-4fcb-b085-279b44f09c78/veminuji.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_306841db8eae4b95931b9fb0c5642f68.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_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 5564 bytes
SHA-256: 43ee35d2c40ecf2260c072d04242c5db803830fc995778b60bbf9cf5109f6812
font_01_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 10696 bytes
SHA-256: 732a6c74e447b76eb78b7503bf7e8d3df7048d91a4199c0a78a60ce2a1288a01