Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e109ae8b3d1a60…

MALICIOUS

PDF

83.7 KB Created: 2021-04-02 20:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: abb2ecef7bb7089753ae43388b1a00b0 SHA-1: 74782abaa6434de7b5f9d886314a333bdbe5a931 SHA-256: 79e109ae8b3d1a60f42677d05ffad9c0d6a6867e5ee0967966b602cb25312cd0
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 0.9992

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://vilenefex.ru/strik?utm_term=fulltone+ocd+review+musicradar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489257/normal_6002c6a150309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_602a17cf2e861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_6056c15f3cef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_602643ddabb28.pdfIn PDF document text
    • http://tewovenaj.22web.org/chicken_soup_for_the_soul_think_positive_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_60074fba49097.pdfIn PDF document text
    • http://sidixul.iblogger.org/3589964881.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/artritis_reumatoide_medigraphic.pdfIn PDF document text
    • http://lipesomidu.epizy.com/14619539203.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_f6dd142812304d1f95ff21abf7f567a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f59c1a2-0a84-49b4-a408-9a828b5e2260/48991855451.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_df18fb057c444a179dfede543d547a88.pdf?index=trueIn PDF document text
    • https://de80b27d-cc0d-4a57-9176-3e06babc0ea8.filesusr.com/ugd/e54fc7_080f6864f2aa49219b8ecb4bb9010231.pdf?index=trueIn PDF document text
    • http://tamevebuzonufi.epizy.com/22609924693.pdfIn PDF document text
    • http://magetamuwunaze.rf.gd/ripex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa1666f-2eea-4013-9230-dea198ea87e5/87782304896.pdfIn PDF document text
    • http://vugovule.epizy.com/vumaxeju.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_f1e504aa7ae043c889be3456da2b6ae7.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_274df9aa3f4446d9a65386e0233013a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e12d966-67e6-4a1d-bd71-2cfc6c2419d9/kabufopenerewuzekolin.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_bfb325aaac834bb599251cc97e3cc8a9.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_fba973a5a3dd4a6e96ff1bbaf48dc167.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_318778e387ea40699d2b6f6cb120ee9d.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_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 5192 bytes
SHA-256: da0b32a33c316ea0920c1efeb55df10cb99984b13d9b2c962cf7cce7a251a12b
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 11100 bytes
SHA-256: 153c5043e1e037fe7fe8a189d0c589d1e5396d8f95d88e551dc1ba19f2854e5a