Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e66cd1240f5f529…

MALICIOUS

PDF

76.4 KB Created: 2021-02-27 00:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc0163958e57d1a78f92c2d57b3cae72 SHA-1: 7d6ad824639ac9d5a59a5976f54e9e31461b7848 SHA-256: 2e66cd1240f5f529a26725611eaa207197275178cfa11afb2d59f8050ff5e2e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document, masking its malicious intent.

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://jottigo.ru/award?keyword=advanced+player%2527s+guide+pathfinder+2e+release+date PDF link annotation
    • http://copyrightsupport-ig.com/how_to_tee_off_in_disc_golfhxgb4.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/40001866701.pdfIn PDF document text
    • http://snt-br.ru/sonapejupagelexunuramevz5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_6038d209dac2a.pdfIn PDF document text
    • http://ru-en.xyz/phrases_sentences_worksheetswqbzs.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/22928481378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fd79cd17b6ed.pdfIn PDF document text
    • http://phillipen.online/19558136353qxuxn.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/siminurika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_5fd74ed3b828c.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/can_spread_betting_be_profitable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376087/normal_5ff8ac721d2e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff0bb7dc1c85.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/how_to_tell_polarity_from_molecular_geometry.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/donivuzufifom.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/gixawetopoli/hp_8625_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/discount_formal_dress_stores.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/nitrogen_oxide_formation_in_combustion.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/83385581554.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_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5736 bytes
SHA-256: 21f264102f0aeb454e1bd641762d17f2f23315fae8870d55b71d1da8d05b7d6b
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 10476 bytes
SHA-256: 8c606e9254909696760cebe1c6eca45de800b01d322e9ccae0e4a3c6c3285e0b

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