Malicious PDF — malware analysis report

Static analysis result for SHA-256 0612abc33d9e4f44…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8506e16529602d12f8961dc5cbebc06 SHA-1: f25af9c6867335c8f66dff50588b2486f8451bbf SHA-256: 0612abc33d9e4f44c962cbc15868d2667771a9ecaea4513cc45b266f728189c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms or disposable hosting, indicating a phishing or malware distribution attempt. The PDF's structure and embedded URIs suggest it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=how+to+move+stuff+to+an+sd+card PDF link annotation
    • https://nezrenweb.com/calisma2/files/uploads/22840292046.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/82381251655.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tamodisubafisugijexedibud.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/didajebojapawav.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/nodapema.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/soniw.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/31355415804.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/diwemitovogada.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/p79nhlo5i147u21cisilspt6bm/88063530617.pdfIn PDF document text
    • http://rooptex.com/uploads/12746247307.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/20596172424.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/dowemumedozirimudewipo.pdfIn PDF document text
    • http://sgpeo.pl/users/file/22100969802.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210917_294FDFA600AA47B2.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/83267265795.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///noripapibuzux.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/92763469873.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109082128543425.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210906032313173.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/siteje.pdfIn PDF document text
    • http://kmsenior.org/file/files/jarogiwekigaze.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/59278527438.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 19168 bytes
SHA-256: 9755ceadf03bdf4f9bd7324963c9f40bc5ec716abed5812094ca7308b065ebd9
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 10740 bytes
SHA-256: fb4fc3c1deb7c7d03697dd5b118466aefb4ff55777417df17242e8f4d1f80c81
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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