Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00561bb9c39e066…

MALICIOUS

PDF

102.6 KB Created: 2020-12-08 17:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 621b3ae1eb7234703691ebddeef4a03d SHA-1: 1fb63cad5835d3016100de3872de866ff7d920e3 SHA-256: b00561bb9c39e0665c78b20f040de8b73a7e33811f9487aac9376244d3de9e0f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. It contains numerous embedded URLs pointing to potentially malicious or disposable hosting sites, designed to lure users to external content. The primary malicious URL identified is https://cctraff.ru/strik?utm_term=bloodmallet+for+healers, which likely serves as a gateway to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=bloodmallet+for+healers In PDF document text
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/runeridedazazetujomo.pdfIn PDF document text
    • https://jepusujejo.weebly.com/uploads/1/3/4/5/134598091/malude_jifavefifines.pdfIn PDF document text
    • https://famixupeb.weebly.com/uploads/1/3/4/7/134733803/bcaa58744b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87f73bcda79.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/acbb91bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fab96a41019e.pdfIn PDF document text
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/dagugirimevudevone.pdfIn PDF document text
    • https://bififofivajarat.weebly.com/uploads/1/3/4/3/134315789/3b5b7793.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/lunavufakuvusiwugez.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/7a39bae2-2411-4c88-bf12-7157074784a7/perfil_de_recepcionista_de_hotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094bb7d5-3233-476a-a901-626c57cc50a4/dan_carlin_khan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00bd548d-c7bc-473e-a1a6-477d5c95f866/91560911464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ac9d03-abd2-4b68-b66d-fc7e7157f201/67771955224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb2d55d-0516-4c2f-aefa-0d37dfc65443/40x_escape_cheat_27.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64afcf64-5c35-4b5c-949a-1ddffd665ef0/40057124380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03dae4fb-ef54-42f2-9b68-ce34075ac9c0/pobenezibonevipulizij.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00014235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14235 5312 bytes
SHA-256: bd970d6957e47206bd8efbdbf1e75ff301c01d654ba1a3a581de421ad112c608
font_02_sfnt_off0001548d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548D 5196 bytes
SHA-256: 6a3fa6b7934283925f821ffbce72b7ab509942c58c1935ce145ae322ff1036da
font_03_sfnt_off0001660d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660D 11500 bytes
SHA-256: 1be528f03bc143a6545d618672d6235407064673f9ac61789f341a133cfd3cce