Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c2d42c689b3160…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 09:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed1fb474237c9590d0799438820008d9 SHA-1: fc6481e5795636b2ddbcd63588ef547e1197b861 SHA-256: f3c2d42c689b3160a5501fe8d38e6af5ec721a009d9cff477eacc86cbdfbf276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://htwy.com/upload/file/kerodejareposozadulo.pdf In PDF document text
    • http://www.rify.us/cms-uploads/files/9725396909.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/79367055208.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/dosoboxalomot.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/80635844785.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/80416098048.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fusesidodeguwexokivip.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/30515675439.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/50316700086.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/28169484532.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/binuvepaga.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/nuxopijimuxomari.pdfIn PDF document text
    • http://lamay.de/userfiles/file/sujob.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/3442743020.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ouhg352t4uahe2b82bqib7ono6/juzeribigabek.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7423128b648a972492b9b5ae73c22931/mubijibuwep.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/52444947856.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/nakavesolajufivi.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210914/file/1631571701.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/rekorusukawuvuwudavol.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/waguv.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/ralemaku.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/nuxojoxuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=player+pro+premiumPDF 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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 10256 bytes
SHA-256: 59278a5101c998b65c0b4e916297af677e1e88bf76068d44d3eba005b2d5f71c
font_01_sfnt_off0000c517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC517 15428 bytes
SHA-256: 21b7113b36c80537aefdab791cda34f9bd66bbfcb044249a3c4a1c5b82b16621
font_02_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1