Malicious PDF — malware analysis report

Static analysis result for SHA-256 b915fd3dadb5d228…

MALICIOUS

PDF

70.3 KB Created: 2020-11-26 07:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a93c34c8577dbcc8de9a7b888ac9378b SHA-1: 93703463c128e5d1c160395a4af210c7be72b059 SHA-256: b915fd3dadb5d22848899c219bf3a8f0f3b5ee1d73539f0ed16982b8ab99270e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffine.ru/strik?utm_term=desanimo+en+la+biblia+versiculos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477183/normal_5fa8ae4687bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5f96a226201a1.pdfIn PDF document text
    • https://viziwebaf.weebly.com/uploads/1/3/3/9/133999863/juwolepumajida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_5fb5b77d59197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33398f60-eca3-4098-8f49-e04f5f818153/top_rated_sites_for_airline_tickets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb188891-1fac-4265-a0a5-30a8edc1ea75/32752493065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4d255a-f5c1-4ad5-af5b-83203e708d6d/46246872056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947e6221-6e7e-43ea-a7ee-cc4cfc97111f/78099491290.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/19362060458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1344adbc-603f-4734-816d-d9a4799df683/kamen_rider_den_o.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8eefa6-3775-42d9-b529-b29105e6feb2/belated_happy_birthday_images_and_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f2808f-15c0-4af9-9db7-f53e3f5fb3c5/dutugalu.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/sairat_movie_naa_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2afaa2-9405-4013-ba93-9bbd8eb6499f/icloud_app_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f8c7c5-dd5e-4f59-876f-b4981b2d5ad6/davuroluvemuvisu.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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 5144 bytes
SHA-256: 95e9624d2113c92b86ad1a35fbe67118c920e78afef1596a2412b500dbe9f5f9
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 11096 bytes
SHA-256: 53068e4bc5a0aedafa691a5ca88492a4756888e08a42bc0f02f30766585af0b5

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