Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ac20fd5b834699…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 08:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad6cc69584ad9b9d797539cd394659dc SHA-1: 36089a60d05857920f3c8a2561b3a485c3df992b SHA-256: 07ac20fd5b834699411f1a786b5a344a807b85c1f5a134e3b83fc91523068a18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://okun.su/upload/file/65553388072.pdf In PDF document text
    • http://techcessgroups.com/userfiles/file/35253878562.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/wufozeka.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/21316694022.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feef0288fc---jijasuka.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/6223584836.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210902_11214EB51E5FEC3C.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210913_2AC430232ACA71AB.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/43276776815.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/wobutinuginipasel.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/79752968608.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/22056881860.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/89498422575.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/favasedakalu.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/77972682625.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/5483731747.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909162551.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/92078404032.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613278a8b6f36---29958215289.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/721596830.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/bulivorepuzepazakawisaz.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vubigapenijemurusipuvad.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/46083096835.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/74171571124.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xorolesekogoxowaliret.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/7747250277.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/63182907364.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/gifolidevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=oneplus+3t+best+custom+romPDF link annotation
    • 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 10720 bytes
SHA-256: 89e55f5488aaf66bbc0c19c6e239300a4fd7488fcdc6db541597f9acd727a6ad
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 19172 bytes
SHA-256: 58dc6038736645df30d5f0a2ef480dcd96e1102a381b29000bb1aa79dc2b011e