Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f32b9b73a05e88…

MALICIOUS

PDF

97.2 KB Created: 2021-03-19 19:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: aaeb4480f8aa01849ed0afd849dc416f SHA-1: 69078ce20157db13e81c63e049f754f3bf3c3487 SHA-256: 55f32b9b73a05e881cfffabcc5cf04acfe54c633042a71b102b13f30ede48ca6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gimoguvi.ru/wix?keyword=adjective+adverb+and+noun+clauses+quiz+pdf PDF link annotation
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/potal.pdfIn PDF document text
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/selizoxed.pdfIn PDF document text
    • http://openplafond.xyz/how_to_put_watermark_on_pictures_in_word46luy.pdfIn PDF document text
    • http://honey-love.ru/rusuguvepefitajakenulebupolw.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/1184268.pdfIn PDF document text
    • http://maska-respirator.com/92008155841gvy4a.pdfIn PDF document text
    • http://sanadewa.iblogger.org/nitaruvumotisopa.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/tavefis.pdfIn PDF document text
    • http://salonhq.xyz/what_is_news_nation_on_wgn46g9k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/pafukexowuweni.pdfIn PDF document text
    • http://wegefug.rf.gd/rotigav.pdfIn PDF document text
    • http://jemudizibumak.epizy.com/73353591895.pdfIn PDF document text
    • http://nekipusixewid.epizy.com/movofomezotijebilejo.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/slope_stability_analysis_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea70b42a-b801-411f-b49c-6c2433e3afc8/kijafewuxigijozepadu.pdfIn PDF document text
    • http://godubaxedija.rf.gd/vapofetiserubega.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_11955d96afe2497d9e255ab5cdbcae51.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_08074f0e916b4b50813f225a686c80e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/bumonemewaser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db97cd19-ec94-414a-b385-14d150b33f78/desazadevomuk.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_808cc6b7cd4a4b10b7c2a3057cf41d7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogeguva/assassin_s_creed_identity_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/92747656020.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_fcb041fd2cbb4a9681cdab5e27b39b64.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_71be78594ce848e1b9e9a923a4f36628.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 5588 bytes
SHA-256: d36aa9991975aa4c85684bfbd7c70e16ece520e48dc1f06619b271b8ac55f1ab
font_01_sfnt_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 11860 bytes
SHA-256: 16730dac6f8fa18096adc7b2d444e8cbcd59ed35a03220ed0b45769cd181605a
font_02_sfnt_off00015fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB8 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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