Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c339b51a4621104…

MALICIOUS

PDF

70.4 KB Created: 2021-03-25 14:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 233f22078e158b52ed765122abbeda4e SHA-1: a479557e1dccc3b1a388566e1ebbfb21740c4707 SHA-256: 0c339b51a4621104dbd56a00cc1fc14150b5b16e477dadec98654b04faceb542
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download further payloads.

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://dugedepap.ru/award?keyword=manual+administracion+de+empresas+agropecuarias+pdf PDF link annotation
    • https://zabosete.weebly.com/uploads/1/3/1/1/131164473/samim_tobegubasag_divuguzubumi.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/J51Pjel/aarons_payment_forgiveness.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/ijhf6TA/kemopovivitojarewujeti.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/8116025.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/hfs9tVz/las_vegas_nightclub_tour_bus.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/7825424.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/g47gc0M/82454500663.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/agenHCS/snowball_battle_cats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_524f61b6f2724bcd87df751e13101e51.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_238a77c898e247cdbd256477eef83c1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd8f201-a59a-4808-9903-17ffcfc2a162/2006_toyota_sienna_xle_oil_type.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_95d079d68928417b82d67535f4790d8b.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_99f811b385cd46b68f7040c110b597fa.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_d6433220efe347d0a5bc6a3cee748da7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b69689e-cfa4-4947-8d66-e3ab9a5aef47/36928037704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9a8d32-51fd-4382-afcb-bb5f7526e972/75284042457.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_2655b8477f284cd896a9bf8ce8594805.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_cf97591d46bd4104842e8f3c1918f3ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b5ee60-783c-4b1b-a03a-02d0b450f2ce/93266419662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2016a888-a8f3-462b-bf27-bf79ce0740d0/11852932113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884b2cac-b7f7-49e5-9e1d-dda66b6832d9/33068822222.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_03bc77d1a3c64d01a840aa4fb832df4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbd9564-7f81-40c3-aef8-fc29cbe27c7d/94452074707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586231c2-2447-4d9c-b2ef-c6683ca0e16f/how_to_properly_load_a_top_load_washer_without_agitator.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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 5480 bytes
SHA-256: 46c920409e941845b993ad3db62eaefbe4b732b2ab653cce3ecbce90c343933a
font_01_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 9692 bytes
SHA-256: cc8d81c71f4110a099448c52454e3f3cb6ccf54ee48c37697d1129185c38ed02