Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e70ceb46ca2567a…

MALICIOUS

PDF

81.0 KB Created: 2021-03-01 02:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de04f2d13690b863d4cf3c1a665d6e0 SHA-1: 675f9e8da8e8b87dae32017bc327691e64fee525 SHA-256: 8e70ceb46ca2567ab652b84504982908289029936bbe06777064c0b1c0283734
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and configured as link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=wages+for+housework+federici
    • http://parrrtner.xyz/renezanofopipafeligonam5e3a.pdf
    • http://energierecrute-emplois.com/80948444158u9wu2.pdf
    • https://xulazipilo.weebly.com/uploads/1/3/5/9/135958699/4573375.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5fdb1d2148e72.pdf
    • https://cdn-cms.f-static.net/uploads/4414500/normal_60394d32026aa.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/jetumoted.pdf
    • http://uscreditinquiry.info/vozejt3bek.pdf
    • http://info-pages.ru/how_to_reset_maytag_washer_error_codesq1xay.pdf
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/8112796.pdf
    • https://cdn-cms.f-static.net/uploads/4385417/normal_600ad8ac71ef6.pdf
    • http://basiditdcf.space/how_to_use_camera_on_syma_x5cwlj55.pdf
    • http://onlinetyz.xyz/what_kind_of_oil_goes_in_a_2012_hyundai_sonata59joo.pdf
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fe01e81f0233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jepitatumezelo.epizy.com/78286256788.pdf
    • http://bavipilebevim.epizy.com/forederibovatolikolutawuf.pdf
    • 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_off0000f40e.bin
a0bba12666f408cd1f4f9cb94832cd8ebceb4b291387dc993d5c7d2a1a0c1a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 5116 bytes
font_01_sfnt_off000105a0.bin
021334cf804b104daee041c72c53f20f3587d2a0ad1de8e44bb32b4291ee4c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10304 bytes
font_02_sfnt_off000128e7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 4324 bytes

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