Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fdd42329e800f9…

MALICIOUS

PDF

76.8 KB Created: 2021-04-29 14:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f54a3f69394ecc46fbe1839ac48c582c SHA-1: 519aa783613e68c9ac6272be35c1cb2742dffa3b SHA-256: 69fdd42329e800f98904e52d53e715c63b542e0fcd50d71fa90023d6db036167
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is vilenefex.ru, which is presented under the guise of interview questions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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=interview+questions+and+answers+for+administrative+assistant
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/regusilawa_dibap_monabulusoto_jiwot.pdf
    • https://dofusugizubev.weebly.com/uploads/1/3/4/1/134108946/tuzipugan.pdf
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/9610ff2.pdf
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdf
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/tefuma.pdf
    • https://vudolexululuj.weebly.com/uploads/1/3/1/0/131070894/bobezukuwesibixu.pdf
    • https://cdn.sqhk.co/zolilogifuxe/xVeiehb/94968038350.pdf
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/a0ca625cb42c.pdf
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/35069e523aa376d.pdf
    • https://cdn.sqhk.co/vovigewuva/3iciHwU/2591175109.pdf
    • https://cdn.sqhk.co/zatakabe/eWKghTZ/calibration_of_calorimeter_lab_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a81e394c-c651-420a-81cf-76ada1766079/vogejopovefazezadez.pdf
    • http://nugafafekovad.epizy.com/91269745162.pdf
    • https://s3.amazonaws.com/zijivevip/shatter_me_book_4_summary.pdf
    • https://uploads.strikinglycdn.com/files/974470d2-6294-47ac-a9f2-953e86e5f28c/what_are_the_colours_of_nature.pdf
    • https://s3.amazonaws.com/gixirojozogufux/what_kind_of_battery_does_a_chevy_malibu_take.pdf
    • https://uploads.strikinglycdn.com/files/62511edb-8cff-4cf1-884f-8241e9584742/munuxodakebosunekavozimi.pdf
    • http://gazugitub.epizy.com/vopipativobagunubodosibod.pdf
    • http://zazisuj.epizy.com/29727151410.pdf
    • http://wiraxowofes.epizy.com/shelf_plans.pdf
    • https://s3.amazonaws.com/tezude/conductive_rubber_sheet_suppliers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12a.bin
1af4f48b947a71220ce26133d9a8fe5f5a7f41f934ffa966e01af5256562f7d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 5236 bytes
font_01_sfnt_off000102f7.bin
f4e7646d974ac178e3c1f08db6c0822168811ef9ca4e61acdeaf8c1641171a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10468 bytes

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