Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7a14c2cf2bf9dd…

MALICIOUS

PDF

62.4 KB Created: 2020-11-30 14:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 43dec4de9324130070ce930a7c27097f SHA-1: eb6a6a59e3051f2d77a96770ceabecc32ae6b08e SHA-256: 4b7a14c2cf2bf9dd43d4db42e45e0923dcb00ebfb73c571f3a33af08172f5abc
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malicious content. The primary URL, 'https://traffmen.ru/strik?utm_term=wisconsin+probation+and+parole+jobs', suggests a lure related to job opportunities, likely for phishing or scam purposes. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/strik?utm_term=wisconsin+probation+and+parole+jobs In PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/ed847ec.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/6065647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f8774e93b08c.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/b475e4.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/dceeb60c58.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/wafofala-logolirozid-zevadegajirut.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/dujulovukopofelig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5f9ce2212fb56.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/6168241.pdfIn PDF document text
    • https://jikanozirupeson.weebly.com/uploads/1/3/4/6/134656521/lodokibobirofonulax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/turip/affine_differential_geometry.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/33966376253.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/today_kharian_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0fa43ec-7ffc-4833-b954-c1fc771047a7/la_insoportable_levedad_del_ser.pdf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A9 5296 bytes
SHA-256: 47a54b440bbe5fc2e1f2317ee6bc6bbb320048e1a2ed546246e7a1ef982cc893
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 9896 bytes
SHA-256: 7d57c3c00a04d868920032524c35d9643fca11db322b562c43f7455b1ea52166

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