Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69c5458ae804104…

MALICIOUS

PDF

72.0 KB Created: 2021-06-04 16:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 07844bdc159e5734d28ff613604fa29e SHA-1: eec31f27791fff859cefd5968f7b26df63de5c7b SHA-256: d69c5458ae804104de4f2c46702674d7b0500ffa61a96b5e7922b7e86e08de87
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to other PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://oniceh.ru/pbw?utm_term=theory+of+absolute+cost+advantage+pdf', is likely part of this network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://oniceh.ru/pbw?utm_term=theory+of+absolute+cost+advantage+pdf PDF link annotation
    • https://sejiganabukuja.weebly.com/uploads/1/3/4/5/134585043/1042227.pdfIn PDF document text
    • https://welofubevi.weebly.com/uploads/1/3/1/8/131856084/tawixiwutomimu.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/762777.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/4230527.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/69aa92066e2d3a4.pdfIn PDF document text
    • https://kinamolifurepe.weebly.com/uploads/1/3/2/7/132710726/vevizu_vixuvujobuxala_bavobej.pdfIn PDF document text
    • https://juxetume.weebly.com/uploads/1/3/4/8/134879156/207617.pdfIn PDF document text
    • https://letenotej.weebly.com/uploads/1/3/4/5/134595585/nodasekogixek-nerejoxoz-bagug-gabiduwekaxek.pdfIn PDF document text
    • https://nifazupu.weebly.com/uploads/1/3/4/5/134507595/vetefisaw-lemewotenobere-susubuwabugev.pdfIn PDF document text
    • https://vimubuko.weebly.com/uploads/1/3/4/6/134687604/kanudafimedas.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/196488.pdfIn PDF document text
    • https://rirosivipoxutu.weebly.com/uploads/1/3/2/3/132302830/bff86681a5e.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/7350549.pdfIn PDF document text
    • https://dowabibagugodu.weebly.com/uploads/1/3/4/6/134697665/xopibodenopava_tovufa_sipiwujof_pawelelezexagom.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/noriseluwedom.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/7051814.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/8570b7a9-d259-423a-a034-2df3a5d303ef/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d365b61-8d05-44e6-8c85-593e627b67f6/sample_warning_letter_for_being_late.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144457578/td_bank_routing_number_for_wires_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6081ec-cd77-49a6-b9c7-2a2f8d5fb29f/what_are_the_components_of_general_systems_theory.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144501897/90880494328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e713374-3b9c-4496-893a-bc3efea00ed9/delonghi_magnifica_s_descale_procedure.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 5668 bytes
SHA-256: 0a128bdb1357dad040d578bf2db9ff79456553ebaded4a6277cb2fc1e51ce506
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 11772 bytes
SHA-256: 3b65ded4d0540c466ce15365ac508b4226432a2ecc7554ba4963f9f65cf6eab0