Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d4f65e5b463e84…

MALICIOUS

PDF

74.6 KB Created: 2021-03-18 09:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0452b259749dc9d06798c8d4ebd3bdf6 SHA-1: bb688706eda539fa0db9387e75846cf056a4d6d8 SHA-256: a2d4f65e5b463e8443aec2d6f613cb6acab13dc034c5e216f615ed6ea6cc3029
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

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://jumiwimov.ru/123?utm_term=ambassadors+of+christ+choir PDF link annotation
    • http://idealica-itufficiale.website/7141207698741ndx.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/santarella_prontuario_del_cemento_armato.pdfIn PDF document text
    • http://itwow.info/26583910453wbmw8.pdfIn PDF document text
    • https://zogosozel.weebly.com/uploads/1/3/1/4/131406999/dofiramobusibegefu.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/but_although_however_exercises.pdfIn PDF document text
    • https://tazateniko.weebly.com/uploads/1/3/4/8/134885152/62e1d.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/e1569a49530218e.pdfIn PDF document text
    • https://regifedemez.weebly.com/uploads/1/3/1/4/131406591/a8961d.pdfIn PDF document text
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/3883088.pdfIn PDF document text
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/854953.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/39507208524.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/99c067d2c.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/misowigojekozoxiwera.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/53537732177.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/11268308356.pdfIn PDF document text
    • http://goproonly.com/89104260090dv9ul.pdfIn PDF document text
    • https://mosiwiwemupal.weebly.com/uploads/1/3/1/3/131383889/0ee0a59a0e.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/kitixufitezamilanop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanugifop.atwebpages.com/salvage_camaro_for_sale_in_texas.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_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5356 bytes
SHA-256: 07214bd82284940970eb6d0fcdab87bc43fb34aa08b680dd8bb54c184e522cbf
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 10900 bytes
SHA-256: c89af2b59d90690f9e810634e50d90a7864c8a05b25c97dd09a25d6b93469fb5

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