Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e847dc0f7525300…

MALICIOUS

PDF

93.7 KB Created: 2021-03-06 07:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f433b879858dfb798db97d081410546e SHA-1: 35d75ff7f9ff30c2d29f15bfb5605f46c4bac1f0 SHA-256: 4e847dc0f752530044070263bf63a92260ae4f6b850dbb43a654d68ebe2263ec
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 0.9997

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://leonvi.ru/strik?utm_term=htc+one+m8+camera+review PDF link annotation
    • http://tuwimig.scienceontheweb.net/chemical_kinetics_and_dynamics_steinfeld.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/lzxkhbD/14033931479.pdfIn PDF document text
    • http://wejesigozolireb.getenjoyment.net/42951952836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_6014170fcf347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_6005ba0e59bf6.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/kjcOjbK/moxaperolow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ffb0c362e57c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcc8c1b3f356.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/vakugijogil.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/vejujuvakofofupelu.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/a249612a-624c-4eed-a147-bbf707721168/troubleshooting_kenmore_electric_dryer_no_heat.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_e8e77fca62054a9b9faabb99ea5fb9e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da42288-9ae7-4e32-98f6-1ad011bc3ddc/bumovebupanulezeleli.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_eec7040fbf814325b96f7c46e6d1bf0f.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_53f847174aee4f098dd91f4f1706e93a.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_9dff3a2ec3f94e548aeab2129f70d9c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2fd964-fc46-4d90-bf57-85a01eda38f5/how_do_i_unlock_the_retail_lock_on_my_toshiba_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/969b2272-45cf-48cc-82b2-d49cec3f4bac/zimovamuxazakinasopobeju.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_39afbd23e531487599b09a93ef88a3fc.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_57df3ade606b495094a700a1d768a1a7.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_f0004a4f96b54f09944c1c9709749853.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_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 5040 bytes
SHA-256: 02afdb53eba2bbc6ee5e76030af5dce9a141130160c760e6dd4d1b21eaddcbe6
font_01_sfnt_off00014569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 10500 bytes
SHA-256: 9ad73ac5c2f7f8380d811c1833dd857fa1e24adc261b020b01d8e6caeba1bade

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