Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa85f55c18de678…

MALICIOUS

PDF

80.0 KB Created: 2021-05-03 10:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dd7133fc5d65cfcc3b5dd339c423f45d SHA-1: a178837ee765031372658ba3346fb17cba5707cb SHA-256: 9fa85f55c18de67866c677f9dab653024bb03f4b2f0f7abd41329d3cac884384
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, including a potential redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=emotion+cards+for+autism+pdf PDF link annotation
    • https://suxutusebosogu.weebly.com/uploads/1/3/1/3/131379987/futejawezezem.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/welopama_jamakezawonoro_bivasogofuj_fegepujew.pdfIn PDF document text
    • https://fugurisugo.weebly.com/uploads/1/3/6/0/136086283/badilineb_fobufepesezoz_vololuwarabi.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/mesimafovazus.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/five_dialogues_crito_summary.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/xumetenifije.pdfIn PDF document text
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/xonitujobeg.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/80206653450.pdfIn PDF document text
    • https://naratejog.weebly.com/uploads/1/3/2/6/132682615/5908991.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/qcy_qy8_bluetooth_headphones.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/dewevegabak.pdfIn PDF document text
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/zezurisegiroxejur.pdfIn PDF document text
    • https://kefepifumadig.weebly.com/uploads/1/3/1/3/131383651/34c3e.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/waben-ridevawamesuwu-sugad.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/xunilukegez/13118015218.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/bushnell_neo_xs_firmware_update.pdfIn PDF document text
    • https://5fb3b2f4-e86d-4029-b823-ac5950ddf4c1.filesusr.com/ugd/c0aa49_99e226c4de8349afb5acc148e3aaf4c8.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_3175b20cbce14310973bdb7838e3fd62.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_baf24ee4de0749b783e89d6855ae4dcc.pdf?index=trueIn PDF document text
    • http://xujided.onlinewebshop.net/amitav_ghosh_glass_palace.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/field_crop_protection_guide_manitoba.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/38274803209.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_1fb886ee66ef4065be73dbf436aeb61e.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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 5228 bytes
SHA-256: 70b3cb5ed1000086d43a0590af0a0a07d42c2351761a1c49aa0ab154418ca14b
font_01_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 11044 bytes
SHA-256: c92ae0a1043801ff09af01ee04116d252709630a153757c61e8d5de378bb2c5e