Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7b129d8b62cc53…

MALICIOUS

PDF

85.0 KB Created: 2021-06-11 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8a2f8e87fbf20c5e2ee4cfada49cb752 SHA-1: 0996ea3336762bc0c87501128d8d5c3ed6611d25 SHA-256: 4e7b129d8b62cc53a8c083a90272109dff115081059eeb1c1befdb06742bbd65
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified as a link farm. The primary URL, 'https://krisoc.ru/pbw?utm_term=discord+de+gta+rp', suggests a potential phishing or scam lure related to 'discord de gta rp'. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate malicious intent for SEO manipulation or directing users to potentially harmful content. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://krisoc.ru/pbw?utm_term=discord+de+gta+rp PDF link annotation
    • https://rozogefeju.weebly.com/uploads/1/3/1/3/131398259/4987811.pdfIn PDF document text
    • https://kakujaboregoj.weebly.com/uploads/1/3/5/3/135341432/13c921eccbee27.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/xafujinizomavi.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/b2e132bfa4b8f0.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/xanum.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/mabuvu.pdfIn PDF document text
    • https://fujidefabez.weebly.com/uploads/1/3/4/5/134512048/vepuza_kegesuvoge_vufavomajen_rogif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwuromo.pbworks.com/f/what_is_the_definition_of_retained_earnings_on_a_balance_sheet.pdfIn PDF document text
    • http://zejokij.pbworks.com/f/template_ppt_pastel_free.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/gor_banjara_lambani_song_please.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/jadebiruxazumavama.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/98761079154.pdfIn PDF document text
    • http://dadidijaze.pbworks.com/w/file/fetch/145066293/dark_souls_3_assassin_guide.pdfIn PDF document text
    • http://dagomiwavi.pbworks.com/f/after_movie_series_in_order.pdfIn PDF document text
    • http://gaguwufajij.pbworks.com/f/zizifiw.pdfIn PDF document text
    • http://tosixuze.pbworks.com/f/my_talking_tom_2_hack_mod_apk.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 5208 bytes
SHA-256: a747443c27bb80e290d43ff84be7c28cd8877873426def306befae47e103d5cf
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 1796 bytes
SHA-256: d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 22576 bytes
SHA-256: 400cd09428a9571b2bb86ad3ee2d724542d0cf9db119b4cf4fc51fd68336a654
font_03_sfnt_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 16272 bytes
SHA-256: c21d0d793ab5680d57c6db2baeb8b4140412da9c304d98748fc6d997cc8cb20c