Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc22985d22b16d6…

MALICIOUS

PDF

71.8 KB Created: 2021-01-19 20:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ac3b5fbd787d88101d79ad48444aefd SHA-1: 9764b284e70eee2159cbc622e691ef4ff5ff210c SHA-256: ebc22985d22b16d6e43f03442ab9c11a7c836d914276c20cf633e06d17a66a15
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and likely phishing-related. It contains numerous external URIs, with a prominent one being 'https://druttle.ru/123?utm_term=spy+google+docs', suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing pretext.

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://druttle.ru/123?utm_term=spy+google+docs PDF link annotation
    • https://site-1173136.mozfiles.com/files/1173136/karalelukajenubo.pdfIn PDF document text
    • https://site-1215606.mozfiles.com/files/1215606/firipeva.pdfIn PDF document text
    • https://site-1168410.mozfiles.com/files/1168410/xivakorulaboxukorebe.pdfIn PDF document text
    • http://jolowenifar.iblogger.org/fha_guidelines_require_a_waiting_period.pdfIn PDF document text
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/69f8cce1c.pdfIn PDF document text
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/3949549.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/e4c08b5175c4.pdfIn PDF document text
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/523502.pdfIn PDF document text
    • https://site-1246999.mozfiles.com/files/1246999/babunurufiwidi.pdfIn PDF document text
    • https://site-1175416.mozfiles.com/files/1175416/carbonylate_anions.pdfIn PDF document text
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/vimokuw.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/gufosugerorotozavi.pdfIn PDF document text
    • https://jubonofu.weebly.com/uploads/1/3/4/2/134234671/pizig.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/fetawoporimemami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozibuxadotoba.epizy.com/nifewitujisuvomugadunot.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/15813876257.pdfIn PDF document text
    • http://kuwoguki.epizy.com/sitidivesonewukabe.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/reading_comprehension_worksheets_new_zealand.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 5140 bytes
SHA-256: 5ce9c35f0e35653e946b2dc812b2d8aba4e959dedc3d680f580990cf5c156df3
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10788 bytes
SHA-256: a362892b786fe73ff8418ff2f293f37f13580566f3d5439bbf9081fbf28ea81a

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