Malicious PDF — malware analysis report

Static analysis result for SHA-256 350cb4fb0ef96f95…

MALICIOUS

PDF

74.2 KB Created: 2021-01-23 08:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae28c260331a78fcae6fceab52c3b0c0 SHA-1: 7364bc6b4e9f8668e20530f1767e919d9028711c SHA-256: 350cb4fb0ef96f95db924eb4b6e8d4560e26ff066c457c6359a6a9910c34c427
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=madera+de+cedro+precio+colombia
    • https://static.s123-cdn-static.com/uploads/4393044/normal_5fcff747ee10b.pdf
    • https://cdn.sqhk.co/disidudi/Cidgehb/vomukamewelibogisifef.pdf
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fcaf80c2ed5d.pdf
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5fe59c33e84d0.pdf
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fdd44fa8e73b.pdf
    • https://site-1177842.mozfiles.com/files/1177842/okra_nutritional_info.pdf
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/269bb188c.pdf
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/boxaji_belagota_volajol.pdf
    • https://cdn.sqhk.co/jutafegobexe/wUgdjf5/76059271007.pdf
    • https://cdn.sqhk.co/fapewejav/ijEjjO9/rigogigebasemifepalu.pdf
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/poboniwomupovuf.pdf
    • https://cdn.sqhk.co/patagarinixa/jfyJANq/briefing_application_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82a.bin
3d7a12ce17db9efff83430c13c12d81396a315997bcfcd85ec85b5e694a2abed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 4788 bytes
font_01_sfnt_off0000e85a.bin
c08baf895aec6723becce95557bfcfbb2fc9e4131969a0a303bac123a6569fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 11532 bytes
font_02_sfnt_off00010df4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 4324 bytes