Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c316895a80025f…

MALICIOUS

PDF

71.8 KB Created: 2021-04-02 10:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 41f154bb91ead2f5e6e9c15686acc5b9 SHA-1: 008d41366665f6c8bc6dbe5d82197a0d68f26cfd SHA-256: 30c316895a80025fd6b560a66d321068c70edd469122a4aea9400f1f8ddd0e10
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to other PDF documents, many hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=sports+heads+football PDF link annotation
    • https://kuwovuvonix.weebly.com/uploads/1/3/5/9/135971109/jedufavidurudego.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/luvawolosafomev-sogojipi-mojunibebidate-debomefas.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/gawedelukas_naraletokiwez.pdfIn PDF document text
    • https://lukenuba.weebly.com/uploads/1/3/1/6/131636916/968140ae.pdfIn PDF document text
    • https://mudasolujo.weebly.com/uploads/1/3/4/8/134886274/nisunowadiva-ginakexu-nixuke-godivuwin.pdfIn PDF document text
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/zigikug.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/kifagowuvijinod.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/85324589.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/pituburuvow.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/fuvesomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lolamidubafa.rf.gd/crucial_conversations_participant_toolkit.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_a5308c2403c54d89a2be8e0844a499e7.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_482adca946dc4ffe99e423e6e19909d8.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_574ae0fd21e34ef3811e34aa530699b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/famevowax.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_3952802f727a40b28ed989124c678195.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/boposodeba.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/john_deere_tractor_lowest_price.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_3fb8b2daefd649c7a69a96c5ecd86896.pdf?index=trueIn PDF document text
    • http://pivirujifija.epizy.com/how_to_grease_screw_drive_garage_door_opener.pdfIn PDF document text
    • http://norisufa.epizy.com/act_prep_book_2020_books_a_million.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_653a0a9c4ea847f4b660a1fc3cb5f6f5.pdf?index=trueIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_05d34eb1f3234b31a9d0df99c432e1c1.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_e2f9acd59e5f4700a7dadeb59b788b61.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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 5372 bytes
SHA-256: b6526a9535c8f7e037a3f8888b3cdccbf6d16a39edb3db7d5d5c930fdea64bb6
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10468 bytes
SHA-256: 62a102536089f1b05e55e8f77a09e69e5cc9a32911f90748b8cc4081722c5ad3

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