Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ff058b5b18be2b…

MALICIOUS

PDF

74.5 KB Created: 2021-02-18 17:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d9037ae0ddbb01b0e278f42e7c51986c SHA-1: 3a72fca1c7c04ecfa75731219cd353bbb7057f27 SHA-256: 81ff058b5b18be2bfa7417e00a8a1ab09f9e98e0d0ea1c07834061e2283bd386
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=divine+mercy+chaplet+music+pdf In PDF document text
    • https://solupebasil.weebly.com/uploads/1/3/5/9/135972399/2c2471117d6232.pdfIn PDF document text
    • https://gufubavofunopi.weebly.com/uploads/1/3/4/7/134704705/xipudevasujebu_rivurijexupumu.pdfIn PDF document text
    • http://ejinaya.com/easy_macrame_plant_hangersgrq6d.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/tinukani-xapofinimev-fiwukisowoladed-mifapus.pdfIn PDF document text
    • http://static-start.top/56128635692kah8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_60136084a4cd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482407/normal_6005242b3e392.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/pibovawupazadosojomo.pdfIn PDF document text
    • http://jsexj.fun/tetrahidruro_de_platino_tradicional2glu6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_6029c7c68ac8c.pdfIn PDF document text
    • https://mirurilusenut.weebly.com/uploads/1/3/4/6/134631679/10b2ecd7dc.pdfIn PDF document text
    • http://alifan.store/71387145012a9n4m.pdfIn PDF document text
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/7217156.pdfIn PDF document text
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/ea4c8.pdfIn PDF document text
    • https://xisulufi.weebly.com/uploads/1/3/4/8/134870666/3301104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_5fc89725d6a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_5fc7f410f411c.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/zejako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 5556 bytes
SHA-256: bbc3953d1c9258384f6d0979ab8342a5aea75b17790c7c39ba766faf167ecadc
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10576 bytes
SHA-256: e9749c2dd50e4698adac9d07854dacd65b03699f80615e5da328b36381984281