Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b1b9a7516c0fe6…

MALICIOUS

PDF

79.3 KB Created: 2021-05-10 13:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5d8c84406deb18443c08e5aba22d8346 SHA-1: b054f4b4a19f896574cd77cc6f1db6ac917af7a6 SHA-256: 93b1b9a7516c0fe6f56123fc5df311de0375894cb39a617ebb822f1bf9a944b4
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 0.9994

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://midufefew.ru/strik?utm_term=great+gatsby+chapter+1-3+sparknotes PDF link annotation
    • http://sipipewawezizuf.getenjoyment.net/kadirimovomenowirituvexi.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/6437507711.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/palmistry_full_book.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/lord_of_the_flies_100_question_test_answers.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/75300655602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxodivol.rf.gd/59487697700.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_c3450e8631384a1190a97de4217c45d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d079c8e2-86ce-4358-9a0a-01b4b84e162b/28935661074.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_4f098c5456b14e26b993dbe120062575.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3a106a-012f-4dc3-aeea-204f7d048a97/fimedeponibemup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef5f096-7703-4619-9a93-adb599625f90/65344494525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024c92f7-aa23-484f-b8e1-079c15b5b4a8/bogijuganomawagunari.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_f4eb9273b4af43dcab31bdbd5a850bfe.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_6ae45adb76834e8f9712ff714f5243c3.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_e8a66aa1fc394a64906f6dad750bbde2.pdf?index=trueIn PDF document text
    • http://lunoxeliligop.rf.gd/hop_on_pop_book_summary.pdfIn PDF document text
    • https://83c30a2d-d83c-4020-88f4-fdb7bed8c9e2.filesusr.com/ugd/e59e18_b2dc8b308e1341c694292b38aea54bd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb829251-44ae-4068-a187-2c83efa9b64f/volvo_penta_sx-m_outdrive_parts_diagram.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_974bd0beae3849bd817cafa6349ba8dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/861f2f76-35fa-4e22-bb4d-0b83ef68c39f/nodigaxobisituvizuwerekag.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_725b3b2635fc4f0e9999acd76860f5ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4596ea54-1ae3-4c98-93de-b136c014066c/mizixoxawovazumugad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80b742b-078c-4648-ae7c-2f2720955f9f/61137793408.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_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 5748 bytes
SHA-256: bad983aabf2b7c300025b065b75c24ea091679cfe72278d45aa2a63ca997f4c6
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10764 bytes
SHA-256: d1abcd2454d1c9312489a758e0073474ee717f0008a5787efbc702c496bf0c01