Malicious PDF — malware analysis report

Static analysis result for SHA-256 c488b61144fdc8b4…

MALICIOUS

PDF

157.3 KB Created: 2021-05-31 13:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d7a41dfef02c1085b7a48f0383cb5893 SHA-1: a92d92340f876d3f428049c7f64b1684ae1c9b76 SHA-256: c488b61144fdc8b4785fbe86d512f982e079fe76e400b7e87beda72d9d225cb0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and one specifically linked to a search term for cracking software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs suggests the document is designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=ms+office+2013+free+download+with+crack+file PDF link annotation
    • https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/xewogagimudisevudog.pdfIn PDF document text
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/333069b4dc44a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_6052339a86666.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/rolefib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5ff4cc0f6a7b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_6004f3beea254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fcb53dcaf021.pdfIn PDF document text
    • https://gixodavo.weebly.com/uploads/1/3/4/6/134632057/gedavabo.pdfIn PDF document text
    • https://poturifipejo.weebly.com/uploads/1/3/4/7/134767967/6a905f3b131f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_602310b6c44e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_60199ea7719e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_605c24927904e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5ffd3891da391.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4386092/normal_60b05c79be16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_6032b81a97f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_6016fbc9c363d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eaed8d-d655-4f5c-9892-f66da15b7199/how_do_i_connect_my_logitech_wireless_keyboard_to_my_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7cd5d0-1f72-4e54-bf55-e08ab5073d1d/parenting_from_the_inside_out_audible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78efbd63-9267-43d3-aa76-e7d250c7bffa/duromax_xp10000e_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf54a5df-44a2-4c0d-b87c-3bb64dbcfd57/65645233477.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 102292 bytes
SHA-256: 4a6aba2364107ed1f1f4c9252944c6f73e7e4f27cd4c30536eeb85e22e501d42
font_01_sfnt_off00022b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B8B 5760 bytes
SHA-256: 3c51a5f4299b4eb43a9fe8a808ec5f9811430b0cd9b24dbcf3d1a9ab95c36f29
font_02_sfnt_off00023f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F44 10920 bytes
SHA-256: 0cc77c715d651a6dabbf819d279660f23b9da794d2c53f41b3ff7fa862ee8530

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