Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ca501c060e495f…

MALICIOUS

PDF

82.9 KB Created: 2021-02-24 08:29:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 535a85d9d86928832337241c8194d7c8 SHA-1: c1aa58f26f0e67f400f3dd06bc2d01001021029a SHA-256: 73ca501c060e495fbefb546ccdb24d4b08b188e5cd0827b68644693b8a545c3d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics as malicious, including brand-impersonation credential phishing (Amazon) and ML-based detection. It contains numerous embedded URLs, with a prominent one leading to a redirector that ultimately points to a PDF file, suggesting a multi-stage attack. The presence of PDF-specific heuristics and the nature of the embedded URLs indicate an attempt to exploit users through social engineering, likely for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/wetinuke-wanapu-sarin.pdf.
  • 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://jacksth.ru/wix?keyword=unmatched+air+traffic+control+cheat+apk PDF link annotation
    • http://vodoroding.info/9140552985qs3kr.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/dHMhj5F/fowotewoxitakokut.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/giiciiG/update_software_for_pc.pdfIn PDF document text
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/wetinuke-wanapu-sarin.pdfIn PDF document text
    • http://gibejujefuguxax.22web.org/paxoxokimujus.pdfIn PDF document text
    • http://eurofamily.pro/16161302427mcw64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_601d3df7c07fc.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/4433066.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/903555c0.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/5013972.pdfIn PDF document text
    • https://sunozidugeb.weebly.com/uploads/1/3/4/4/134486191/gilidamuxizu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379960/normal_6007606659b22.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/bosid2J/63539935112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_600a91173f552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_60018931c8378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jupunefubepaza.rf.gd/40172524530.pdfIn PDF document text
    • http://nufagogofuj.epizy.com/pulur.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/investigative_reports_gza.pdfIn PDF document text
    • http://mifazafodig.rf.gd/free_creative_resume_templates_microsoft_word.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5060 bytes
SHA-256: d8a8cb6567f0907194b6844026700472c28391f08b774afd1df1c9b274abda10
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 10636 bytes
SHA-256: 53f1086fc8ea63b6d8de0df68b482944e426bdbceffcfb325c0d61d1e8745dc2
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34