Malicious PDF — malware analysis report

Static analysis result for SHA-256 28999004958edd48…

MALICIOUS

PDF

71.7 KB Created: 2021-03-06 14:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10112d7745316914764f8bc1505bbba4 SHA-1: 1bd7cb5d6f187af72d3e8874b2a2cc471cab8c39 SHA-256: 28999004958edd484d4a0c7062fa385117dfdc0fcd03bcd0491c785dbcade4e2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging a suspicious URL related to 'kenmore elite washer troubleshooting'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=kenmore+elite+washer+troubleshooting+f28
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/73c19c2033e.pdf
    • https://cdn.sqhk.co/jekidase/gfjcqRd/download_cheat_game_crazy_for_speed_2.pdf
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/nikabidakad_jarap_besarafemavize.pdf
    • http://wonozudobitisog.scienceontheweb.net/how_to_study_public_life.pdf
    • http://xofebuledat.scienceontheweb.net/fizuluwinud.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/5506010.pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/2e1baf.pdf
    • https://cdn.sqhk.co/kewudomavave/jidhRgc/buffer_country_meaning_in_bengali.pdf
    • https://cdn.sqhk.co/kewukapugino/sXhe2id/26327484764.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/7831067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wobadumiravolu.atwebpages.com/jetogen.pdf
    • https://s3.amazonaws.com/waxapoz/chehalis_sheet_metal_heating_and_cooling.pdf
    • https://s3.amazonaws.com/dikobepibelun/xitipa.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_3394c931a542410b9311d7d189806161.pdf?index=true
    • https://s3.amazonaws.com/vovuzize/30385395517.pdf
    • https://s3.amazonaws.com/setikizo/98233287280.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_0c709aa956544495a9e3cd4391694378.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/lullaby_of_birdland_sheet_music_piano.pdf
    • https://s3.amazonaws.com/rodakarugupoko/messenger_apk_for_iphone_free.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_off0000db99.bin
e94cc670f649d9303db3786a8c6422c8c381e92b0354e71784d5ea312fae8b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 5708 bytes
font_01_sfnt_off0000eeee.bin
0407210e88afaa56b78d6ea12ff60c455945cff378049782e841284b65bc665a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10184 bytes

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