Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5462419ea6ab6af…

MALICIOUS

PDF

68.5 KB Created: 2021-06-13 19:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b1daf121be5665b01d8a91f47960e90 SHA-1: aae3e5f406dfc486f1e2c1908f34ea7bde2a2e77 SHA-256: c5462419ea6ab6aff4efcd05086c89d2c918b9ec7006f88be815747eecbc8289
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One prominent URL, https://crewmak.ru/pbw?utm_term=advanced+heat+and+mass+transfer+pdf, is likely used to redirect the user to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=advanced+heat+and+mass+transfer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426688/normal_602049eed6f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_60b7f5eae5e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_60b8a4590eca8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5fcad2f6bdbb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_6007d4d273cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fcd9d5047a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fca2a10d2df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_601e4e2b8ddc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60188d1621119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_601a2f6e5a875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5fe334ab62eea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakejidumap.pbworks.com/w/file/fetch/144702663/derecho_procesal_civil_jose_ovalle_favela_decima_edicion.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/15172471336.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144499602/popibadileri.pdfIn PDF document text
    • http://vebimivatid.pbworks.com/w/file/fetch/145250337/kuvukanubivupa.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/2083776566.pdfIn PDF document text
    • http://bugedavamib.pbworks.com/w/file/fetch/145051899/83017922263.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/93057679128.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/watch_any_video_link.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_off0000ceb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 5412 bytes
SHA-256: 0c569fe5a6afd7c4db8829101dc768869dba392ad778770860abc5a46fdc7fa8
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 10728 bytes
SHA-256: fd89d4a989574bb665e4c11ff03dfc256c6c50c250269bf7cbfbc90c9df3155f

Open this report in the interactive analyzer, or submit your own file for analysis.