Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b1e29340ee6197…

MALICIOUS

PDF

74.0 KB Created: 2021-06-03 20:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c53be55585d83f195cab218631288a3 SHA-1: 77f4c703be0656fbe5eb0d09f494a186b5253dbb SHA-256: 56b1e29340ee6197cf8e39f6293ca90c90a94b515984f047e6a0d616587b2838
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating it likely exploits PDF vulnerabilities. The document contains a large number of external links pointing to various domains, suggesting it functions as a link farm. The primary URL, https://ketchas.ru/pbw, appears to be a redirector, potentially leading to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://ketchas.ru/pbw?utm_term=ejercicios+sobre+denotaci%25C3%25B3n+y+connotaci%25C3%25B3n
    • https://cdn-cms.f-static.net/uploads/4468253/normal_601ec23e6de70.pdf
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/tobimakufexoti.pdf
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/ximenaravijetesot.pdf
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/1019700.pdf
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/344575.pdf
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/fosolit.pdf
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/332813.pdf
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/e16ca.pdf
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/b7077e07647b.pdf
    • https://jigulukeduza.weebly.com/uploads/1/3/4/5/134508725/6648890.pdf
    • https://fulinufifirop.weebly.com/uploads/1/3/4/6/134656376/fapejumod-sokonogux-xibajesafuded-welasazujuroda.pdf
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5ff29f09cd2ce.pdf
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/9568784.pdf
    • https://static.s123-cdn-static-d.com/uploads/4412408/normal_60b244bced4d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sipibujewadu.pbworks.com/w/file/fetch/144482673/eitici_ouk_oyunlar_bedava_oyna.pdf
    • http://pinurakus.pbworks.com/w/file/fetch/144533385/rarowuridusevew.pdf
    • http://togusan.pbworks.com/w/file/fetch/144427182/excerpts_from_the_jungle_by_upton_sinclair_summary.pdf
    • http://jevibufile.pbworks.com/w/file/fetch/144545124/distributive_property_of_rational_numbers_worksheet.pdf
    • http://fulusivijomu.pbworks.com/f/606911346.pdf
    • http://zolunegoli.pbworks.com/f/eft_gunsmith_part_3_150_recoil.pdf
    • http://funuvutidip.pbworks.com/f/the_compound_effect_bangla_file_free_download.pdf
    • http://zosajivapesi.pbworks.com/w/file/fetch/144548625/understanding_chemical_equations_worksheet_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb3.bin
f33546bbf66a20c3f4e4849a35775a4d7793cb67aefbab52290a22bd41eea35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 5312 bytes
font_01_sfnt_off0000eea0.bin
bcc7d2761a6c6f85854761e310d077c1967ad046193284fd120088ebb31a3b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 13428 bytes

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