Malicious PDF — malware analysis report

Static analysis result for SHA-256 7469fdbddb4b5346…

MALICIOUS

PDF

82.0 KB Created: 2021-02-20 17:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8ee9c74307d0bffd87bcb1d76104547f SHA-1: 570f3de4fb2648e8fc93db0f1e19fe6a8ec41f00 SHA-256: 7469fdbddb4b534682c187baf1e72c26fdb2e243f49607fcd011da86a03c427d
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 phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=mr+heater+big+buddy+battery+size PDF link annotation
    • https://cdn.sqhk.co/keropolor/gcjdfQ1/bts_song_quiz_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/cB4ijjb/exothermic_graph_name.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/1625129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_600869fd4a3a2.pdfIn PDF document text
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/285436.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/SmUgrjj/pentagon_shape_meaning_in_design.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/eb05602f2.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/hchcETA/pc_games_download_for_windows_7_racing.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/zemitafolanujosele.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/56f37ba92b904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_6029ca39bc57c.pdfIn PDF document text
    • http://matteset-spon.space/manually_adding_addons_wowecifx.pdfIn PDF document text
    • https://cdn.sqhk.co/fanekizesedi/icSn7gd/ordinance_of_1787_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/917gjif/rhea_county_animal_shelter_free_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/wdEjgMI/cut_the_rope_level_2-_10.pdfIn PDF document text
    • http://meetcabinets.xyz/ruzumekameliwunujasomuli5w8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601b436c5bea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fc9bd6d157b6.pdfIn PDF document text
    • http://shoop-fo.ru/vesufobuwuvonigapesegudaoiu6a.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/juliziwojatige/gojazilirimakikivonab.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/ruminate_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/free_backend_server_for_android_app.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 5352 bytes
SHA-256: 9b502a9d9d87ea9ed9a796be9d016cf1cbac23a85ba047a2dfb653040858f21f
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 11828 bytes
SHA-256: 51110c855e3c4bf10abb636a607378f21a072d111cc14f6ba208968c515e181e