Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b29d73a0064778…

MALICIOUS

PDF

73.5 KB Created: 2021-06-09 01:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2565d9941fbfe7838ff86fe958dade83 SHA-1: 3e00b7b32aaeeb98b9c9bec489a21cc639ba4f3f SHA-256: d2b29d73a0064778ac3cb7b0ba02337d9930c3c1f1be577fb35d5977237a9685
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains a link farm with numerous external URLs, including one pointing to 'krisoc.ru', suggesting it's designed to redirect users to potentially harmful sites. The heuristic 'SE_CALLBACK_LURE' further supports a phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=dalton+ga+sheriff+department PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4479214/normal_60b0ed6500445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495042/normal_5fd0e27379bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_604ced3b23f91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ff26177d6807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_60086dbe3208e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6018d64e8d847.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/a1e23a47a0c7.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/xozaxonexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_603deeed22e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_605e0392d8233.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/97721fca-0b95-4550-8888-8f3cdf0aad0c/rock_band_4_guitar_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8cc346b-42bc-462a-8cf0-b95a5df917ec/examen_2do_bimestre_3er_grado_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5a1829-30ab-4f83-9e1c-9b496f422011/xuwolejixogoxigexebagapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20299de-2907-4445-a201-39ad21358ea8/69083705176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1ccf69-ced0-4063-8c8f-d87064e3e514/what_ink_does_hp_envy_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de378e38-9ce0-4291-b930-973275efa6cd/56259725107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6999cd9-67ef-46d9-863c-0444ae42cfd8/resumen_de_tus_zonas_erroneas_capitulo_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee04ece-c7d9-4c97-8322-707342d68c9e/kapotupemorazidelivolem.pdfIn PDF document text
    • http://degagogo.pbworks.com/w/file/fetch/144615591/tejefemexaduxafemabav.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144896094/ielts_listening_reading_and_writing_answer_sheet.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425505/rogaluzirelowekobipevemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c575d8-2e0d-4d8b-9453-76c3e64be25b/35029921459.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5456 bytes
SHA-256: 6bcc86a118d187bfea9b3c955a61715aa813766f722fedaabd551ddb4ef52529
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10648 bytes
SHA-256: 3417b1bc4d18762972519e1869e89c3b401d10e6852a1102be2146d2475777f7