Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d1d494ae70a151…

MALICIOUS

PDF

88.1 KB Created: 2021-04-19 10:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d97678ac5e5144e131af5e970a2b73f4 SHA-1: 60ed0d850ada0953a3cbc3895a95ec4dbf435a48 SHA-256: b6d1d494ae70a151afbe7330025182c4b33d473357e4e9bf75461a1da66ccc8c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=skyrim+ps4+armor+mods+list PDF link annotation
    • http://fito4ka.xyz/81802108267asgon.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/novujijosow-julufa.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/kijoxezinidap-getetawavivefa-polove-rafigava.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/vediporilegulibamipu.pdfIn PDF document text
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/katadona.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/dufusopekidus.pdfIn PDF document text
    • http://hotsales-com.xyz/870507663950tybz.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/monitor_cardaco_speedo_80621g0evnp6159x.pdfIn PDF document text
    • https://ramexolilaburav.weebly.com/uploads/1/3/4/3/134331107/7534995.pdfIn PDF document text
    • http://hotgirls.host/tapipajuxagifow6cjl9.pdfIn PDF document text
    • https://vonupefofuba.weebly.com/uploads/1/3/4/6/134645630/lobesa.pdfIn PDF document text
    • http://kismyketio.com/salems_lot_book_sequelbh5fm.pdfIn PDF document text
    • https://lovalizivida.weebly.com/uploads/1/3/5/9/135990258/3219431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_ef8b30400fa9414e8720d6076eba22d2.pdf?index=trueIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_765465a0639343e4be8067cbcc302dce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/my_camera_icon_disappeared_android.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_0392b24a3f894be6ba4a980d7aa80e86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waduzirader/different_word_for_ride_along_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3a5cd6-fd11-4a97-94f1-f537b39fe407/61630101133.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/gokekivaditevofonidizij.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_2f5da74f772947529a29ebf7a762c93e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/98489012265.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_0f05467a74454f1a888e112bfd20bd0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/475c1523-9b35-4775-9e38-131fc10e7c3d/kujobosofasizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377ab078-e83f-410f-ad9b-c75da437bedf/fokerarokesinej.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_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 5464 bytes
SHA-256: df44927fb1d468f4f5b867d4e5c0d85c37c82c9d45f388d4fd73070f4d0b5e9e
font_01_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 11548 bytes
SHA-256: 9819f2b239dbdfc389668d0256d11c3602fc4d0c69fdc7ea60a6c7e7fb3c7a45

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