Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0061d728a509a6…

MALICIOUS

PDF

74.1 KB Created: 2021-04-03 04:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60d85dc02d7611f391cd5186923ffebb SHA-1: 1a5b8d10819436fdb701074c973b6ebdd142811e SHA-256: 4b0061d728a509a63885428e560f449244bd4a2478c595348e79c50230ed89b6
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 0.9997

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://xajibur.ru/wix?keyword=best+finishing+badges+2k20+slasher PDF link annotation
    • http://all-casino.xyz/suweladokizekiliziwew4xq48.pdfIn PDF document text
    • https://puranezujifa.weebly.com/uploads/1/3/4/5/134582728/zoxiwilovom.pdfIn PDF document text
    • http://podcard2020.site/pajosaxaxexajidizitekofjl37m.pdfIn PDF document text
    • http://servicesforsupport.com/what_are_the_three_major_rivers_in_north_americahxhmr.pdfIn PDF document text
    • https://jamaxukupabidi.weebly.com/uploads/1/3/4/6/134675967/xipesepukoded-kipez-xupev-tojoz.pdfIn PDF document text
    • http://astropsychology.site/couture_sewing_techniques_by_claire_b._shaeffercef6n.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/busagakisixo.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/nejedalepobatulaka.pdfIn PDF document text
    • http://busurman.space/intimate_apparel_play_full_textniu2k.pdfIn PDF document text
    • http://fitness-ital.fun/seven_little_words_bonus_answers_todayicxyc.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/3998064.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/591860.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/kupirenex-kapow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_962e93afc4fd4411a859594262cd90d5.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_ed6d79e04ae54f4d82aebe6cf34be4b3.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_39704b4e33a04ffa9bd4c737bd1346c8.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_93223d9df183465fbf48d2f9b01fc4cd.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_f3b390744b194c509efe7985235cffe6.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_2e727fcd71714b3bbc372e592e687bda.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_2b0e69fa7a3a4ac8be3544e8af50f14a.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 5696 bytes
SHA-256: 50be58c15b59aa7efae58eab860f1cc02eb9716174436004fc8cb1f1c571419c
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10440 bytes
SHA-256: 46846e41b88e71234433e7f857717b2fdb385d546be7251246d9fc0f393a7349