Malicious PDF — malware analysis report

Static analysis result for SHA-256 334f9a1c048685f4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 14:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad3c5f93316a8e6bf849804f87715303 SHA-1: b8ebda4613cd4ae5f600242494400bb806d4a794 SHA-256: 334f9a1c048685f4be2c7abdbd72599bf2ce1ac2b764b0a581cf7f82b88de0c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=best+soccer+drills+for+8+year+olds PDF link annotation
    • https://cdn.sqhk.co/salulilo/gYIyznA/melurujolivitarejewuju.pdfIn PDF document text
    • http://rollernefritmassage.xyz/60544738774y4p00.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/ggi2Mij/tegamuwugenunub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_603be80192208.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/84578647434u6rz0.pdfIn PDF document text
    • http://chebsvet.ru/banach_limitca1sg.pdfIn PDF document text
    • http://babblescoop.store/how_to_make_simple_tissue_paper_flowers_step_by_stepnid3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5fd7a6a551360.pdfIn PDF document text
    • http://kmplitka.shop/zipiwanesarizujalonuba9ili7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_601a643ca7042.pdfIn PDF document text
    • http://koteyarn.moscow/what_is_the_moral_of_the_millers_tale9v9w1.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/nPhdjhK/flight_simulator_2020_planes_not_showing_up.pdfIn PDF document text
    • http://kartaidatodemeleri.com/zapidexodavevzi60v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_5fd9e774a4595.pdfIn PDF document text
    • http://presente-top.store/cirrose_hepatica_fisiopatologiapkxl1.pdfIn PDF document text
    • http://artrosil.xyz/assistant_sales_manager_job_description_resume5ee5b.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/e317fcc8-a5ef-4be5-a5b1-fee4a257cbeb/what_are_the_words_to_hush_little_baby_lullaby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6f4b83-2328-4dd8-951f-7f22e74b856f/65672858820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01811d4c-60fa-4661-9d99-2fd94ab56f4f/mekorugu.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_74f3ed90225f4d3aa62605cd94a4a9d9.pdf?index=trueIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_05c0399f1f754420989aa2937bc753c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29bdc9d1-6ac8-436a-93e1-148005c6d037/50034983289.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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 5360 bytes
SHA-256: 39fabe65cad5c33b73c9e6f137f6b229aa2ebe14cb5fd5b13012e5bef9337884
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 11024 bytes
SHA-256: 01cbb8793b81c29cbfaba8f375f74566379bf06d881d51893d3290c0d01358dc

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