Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1a5bc2913957f4…

MALICIOUS

PDF

80.4 KB Created: 2021-03-30 19:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6169b636d87de6eb5461dbb6be24e9c7 SHA-1: 293c06287f7048bd914d2c893e12b3e00bbe0a3f SHA-256: 9a1a5bc2913957f408d9306a6bf41ae0222ecb7386b2ddef7fec5da0d8122bbb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'baarspo.ru' that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to art and unity, suggesting a social engineering tactic to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+is+unity%252Fharmony+in+art PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467277/normal_5fdb64807a820.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/9diCcG0/xewapamufezur.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/e8hhng9/jekiworijixux.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/62482012139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fd16229b9dff.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/sigugofegasakufoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_60264ce6e0522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5fec992e5f539.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/jhlzicl/77169257937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_6009151bb89b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_af8533e1ce4f440391e8f75c41b65a5c.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/bodoland_movement.pdfIn PDF document text
    • http://mafatiwi.rf.gd/descargar_whatsapp_plus_azul_para_android.pdfIn PDF document text
    • http://tezowojisare.epizy.com/predicting_precipitation_reactions_worksheet.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_afa804e6ed3144a7b89dc2d86a3525f5.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_b4853138fcab4b0bbcc36824079fb436.pdf?index=trueIn PDF document text
    • http://vutelubuvobu.rf.gd/xegafolux.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_e86e4de3b7b648a19818bf8840beb141.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_89a9eff7a6d9430185144bd248009431.pdf?index=trueIn PDF document text
    • http://zilajisalogu.epizy.com/how_to_use_a_weighted_blanket_properly.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/solving_quadratic_equations_examples.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_6905f9ee58d14bd7a455b8aee0210f01.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_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 5044 bytes
SHA-256: d4f2e41d7355c6ab9af5f438d9800887f9402bee2fc4c7032385c1ea5f2c8e29
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 10632 bytes
SHA-256: c37fbed8a87e382b37e32268afae99b2d3197f773ebee002505417702c5b9594

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