Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72e0ef2319040a6…

MALICIOUS

PDF

88.5 KB Created: 2021-03-13 23:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 437514346f521d008916f856bb2e2571 SHA-1: 2bf13b109002c0a668c1500caa3592e7554825bb SHA-256: e72e0ef2319040a6ec1242bb94be4350177cdab261d5b12a9d7ef543dbd2ad99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9997

Heuristics 5

  • 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/wix?keyword=gay+girl+good+god+book+pdf PDF link annotation
    • https://cdn.sqhk.co/fujalapevame/aV2Ddha/gebutujarifuri.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/dichggi/cool_voice_recorders.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/dyifD3W/offroad_4x4_car_driving_download.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/cardiopulmonary_rehabilitation_program_guidelines.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/kamepozelozomufok.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/tv_tokyo_anime_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_535043416a6c4de2a40fc4eb7e5dd2b0.pdf?index=trueIn PDF document text
    • http://gixejemazob.myartsonline.com/chemical_change_and_physical_change_similarities.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/asco_guidelines_her2_fish.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_9abfa3568f32458ca2680ed9c328f26e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/vagitigogozitej.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_df440510c79d40a1ad92c5e406f1f709.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/25080664006.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/mac_pro_longwear_concealer_color_guide.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_15b1890a38784c81b98d0544041006ea.pdf?index=trueIn PDF document text
    • http://zejawira.rf.gd/pitoziruseroluf.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_fbb715b2239f4ae2a96234025b5b7ec1.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_673026074f0041f1806895db92f19df6.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_4dea78180d264c67b1faf6fcf9f2d813.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 5368 bytes
SHA-256: fcb49b1ba9e9ae7c83f643e600545f6958d9dc422b6372ea35aa1a37af33d575
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 10532 bytes
SHA-256: b1ee6ac809479f97c0a198caa17e95ae1ba4500386bad1bff6aa96dc82d1978d
font_02_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 16168 bytes
SHA-256: dcc437beaabc532c244cb2402c7e187dabb6fccd34af89cd9e2270a2a4498d3d

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