Malicious PDF — malware analysis report

Static analysis result for SHA-256 361b352b8f910086…

MALICIOUS

PDF

98.8 KB Created: 2021-02-20 22:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0387a7fdcfb8ae1afaaa14fd5fb7da4f SHA-1: 594d1176237478284ec717be50500042e49d2feb SHA-256: 361b352b8f9100863f6fd47716709e9acfcd2a53c3ce3afc0c7cc7612a112bbe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The embedded URLs likely serve to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/wix?keyword=scholarship+opportunities+in+uk+2020 PDF link annotation
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/1149800.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/d8385d9.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/fogj3FD/89798781338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_601c5f9a23a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffd38cd1d41c.pdfIn PDF document text
    • http://salebox.shop/90_s_boy_bands_playlist3hvsz.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/bf0c9c3cd.pdfIn PDF document text
    • http://crawlmqyu.space/geduf7hh6c.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/higiigg/devilbiss_oxygen_concentrator_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5ff66b54d90c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_6003c1655d68e.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/40qmAgd/4647919791.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/bokelur/gipebusigatu.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/pitobefunevasezupoxuxebis.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/andhra_pradesh_history_for_group_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/whatsapp_messenger_android_app.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_off0001471f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471F 5464 bytes
SHA-256: c9356807ec3a8d87ba5f81f52f01a1c37a5ed4cb1f39ca732052f20ed1061fde
font_01_sfnt_off000159a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A8 10588 bytes
SHA-256: f13cdfa95df8537cf378b6c438a0cd5fe20ce3fde35e8aeb8b1a82325ff1c825

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