Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a5b4c11f4540fa…

MALICIOUS

PDF

68.5 KB Created: 2021-03-01 16:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2d6402e413bba24e88fc2930e04f8a29 SHA-1: 45e6622b6bb8c3fe74d3e2ae3d3d119a49a7b49e SHA-256: a8a5b4c11f4540fa3b7159816b00bdfb1ef3c2a39e9176d98fd2931ddf94b5f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/award?keyword=wizards+of+the+coast+store+support PDF link annotation
    • https://cdn.sqhk.co/rogudokives/iiWhary/zombies_full_movie_disney_free_download.pdfIn PDF document text
    • http://desenusexewu.iblogger.org/dipubokogokazuvusofiraj.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/1509997940056kg3.pdfIn PDF document text
    • https://cdn.sqhk.co/wukibezoso/dghiih6/divizipasajarajodusogodi.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/crNqjdS/train_your_brain_games.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/F8HihoN/aarp_benefits_age.pdfIn PDF document text
    • http://6gusevshop.space/chakram_jagamanta_kutumbam2lzd6.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/noroluxerulol.pdfIn PDF document text
    • https://nibadaxolakawub.weebly.com/uploads/1/3/4/8/134882114/b518f29fdc.pdfIn PDF document text
    • http://deflecfcvy.best/inteligencia_emocional_definicion_en_inglesxla6g.pdfIn PDF document text
    • http://setopin.mypressonline.com/what_does_coronary_artery_stenosis_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zojopek.epizy.com/navupojedobobolukinut.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/best_handheld_led_light_therapy_device_for_wrinkles.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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 5272 bytes
SHA-256: ea75497762bab22c17f075fe431c00ad5a6c948fdb8962b8371840a8c8ec2784
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 10536 bytes
SHA-256: 14418f60df175795e71569d1a1f91ebd9a019d2f30b11692cbe6f1ea8803c210

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