Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc34c9d759a6d217…

MALICIOUS

PDF

65.2 KB Created: 2021-05-17 06:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2c87ee4e3215e00fbff0ebe216022445 SHA-1: 14b5d9a6f6e33657679db810aa357a1ea7e92d2e SHA-256: fc34c9d759a6d217e45060587916cf6b1db3d367c1c76e3499bf6d3c9d7ba7b6
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 0.9996

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://mezovuduw.ru/strik?utm_term=princeton+review+ap+calculus+ab PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fe4fe8cc649d.pdfIn PDF document text
    • http://meselur.22web.org/ipa_phonetic_symbols_with_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_601134e854040.pdfIn PDF document text
    • http://wspring.space/zirizohx0cp.pdfIn PDF document text
    • http://interior.estate/what_is_a_wild_card_game_in_baseball47j1p.pdfIn PDF document text
    • http://procripton.com/zogurukedaj3z1d3.pdfIn PDF document text
    • http://gtmedis.com/28887704324wck11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6026903279faf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_83a0bd3d5e1142d8a26925878b49a9c6.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_28b971b44a264dabb7dad3961ef477da.pdf?index=trueIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_4b37ce3d384b47959cbf8f84986909fb.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_cdcb559097c44bdeaf41963e9da1e8bf.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_20c501241c684df98f7b437156ce0dd8.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_cd0fbd1a2b7a489da479f63646e8dcbc.pdf?index=trueIn PDF document text
    • http://fefekug.rf.gd/98950773273.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_78bc16b0203245c086693095daaebf0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bifoxexerewadumoz.pdfIn PDF document text
    • http://bizijituluwod.rf.gd/28862943356.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_21f37cf7997643e1adfdb41850b876a6.pdf?index=trueIn PDF document text
    • http://belomaruterimos.epizy.com/55482918096.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_a4b676cb1ddf4930bb7ef3f85d8dcd92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/vukazadamudiwepur.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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 5220 bytes
SHA-256: cc8c3965440d51f97ac794cdffb509ab0ad91168d5100c014db8f58913a0b0a9
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 9624 bytes
SHA-256: cee08b1fcc57964e59c57a9a850ba84f9397381c879b98ebc4e549ce0b3dca85