Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c03246d8ac7e61f…

MALICIOUS

PDF

80.5 KB Created: 2021-04-11 05:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 28b5c4bce13e6382eeeed420b771c58f SHA-1: e49af5b6e0aeac2c0e05013a46587f675af069a7 SHA-256: 1c03246d8ac7e61faf82f72c35b6ee82b1afd75188d97ff07f115112d9fdfa8a
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request. While no scripts were explicitly extracted, the presence of numerous external links and the ML classification strongly suggest malicious intent, likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=how+to+get+tricare+referral+online PDF link annotation
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/xusanodifatevovik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_6068ba0d01d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_60662b1ac2368.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/hp_deskjet_2132_error_state.pdfIn PDF document text
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/8963301.pdfIn PDF document text
    • https://gufogirim.weebly.com/uploads/1/3/5/9/135967500/907597.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/58551866647.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/vifiso_jamiko_siwuzir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_60170b2d08989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4af89c9-8fca-45f4-b82b-ea74f99ba7cc/haz_llover_abre_las_puertas_del_cielo_jesus_culture_acordes.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_eed31614dc294f75934df9d6ff0537fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62306d89-d8f8-4502-aece-6695054ef997/29160693163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe37fb9-53b9-40b6-9cf6-f96e944b7f56/66460701295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cbff89-8aab-4342-a85d-cc168fad7b9c/peter_drucker_quotes_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a376c8a9-f6ad-4312-9456-fbb2b6e6614f/venitesurusuvevosavitexum.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/operating_in_the_courts_of_heaven_robert_henderson.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_6e912f8536f9494c9b579690ed42d23e.pdf?index=trueIn PDF document text
    • http://vifidumefitur.atwebpages.com/vesamajewoxukopesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60aabc37-5650-4263-b8ac-041783e94b45/goxosasuve.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_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 4924 bytes
SHA-256: 3db4b0b8e002c21c2dae80ef8663bdf8bfb53de1916e70f71437e98c0beb433f
font_01_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 11000 bytes
SHA-256: 1d974ac16c7c77d9dfd912d4138bd502d8f45ae4c7fb812f129d4af101da172e