Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb339fa098176e7…

MALICIOUS

PDF

74.2 KB Created: 2021-06-08 23:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef29981f7ef869b21546e11cfaba41e2 SHA-1: eab91249260a598a2dad6bf48ce31661bd1ff6bc SHA-256: deb339fa098176e7b738b5f0e3f0bf8033cd1407c9a33f0ebec29da97ef94d35
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, designed to mimic search results for software downloads. The primary URL, 'https://inwebjor.ru/pbw?utm_term=farming+simulator+18+full+apk', suggests a lure for potentially unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://inwebjor.ru/pbw?utm_term=farming+simulator+18+full+apk PDF link annotation
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/vixatuzepusujuseru.pdfIn PDF document text
    • https://paxepogemikut.weebly.com/uploads/1/3/5/3/135316128/motijunudeleza-pupidanibefaxir-finurexasozuxi-wuxisubixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_6049ee2d83b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_606666845dd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fd11801a37fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_606799cb7c127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_6019b9c28c02f.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/7495242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_604d9c6318781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_60415c48df5c2.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/makapalosesag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_600e713785c2a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417139/normal_60b26d07ac390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_6011ec6273266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425533/normal_5fce409eee074.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/4405111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_601606ea4459e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6031d8085a87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fd6fdb3eaa47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_602c8ee368eba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5ff1d2f924096.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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 5484 bytes
SHA-256: a5769d23c465a4ee100e1fd633ef8fbf9973398771f83bf03bff8fb950dd0f28
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10948 bytes
SHA-256: d1fd2c95d76624e9c20f2386393a8b1dc1e8778e397e3854a9641b7f298adbbd