Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dcd9e8d6d38204…

MALICIOUS

PDF

98.0 KB Created: 2021-09-20 18:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b20ae45f8af1c1824da36c425910e2c SHA-1: 42c01eff6bc7056a06b0b32ba6edcd73c5b07648 SHA-256: 44dcd9e8d6d3820454ab0375a29759003a3a29ad94bfbbb71896dcd8246ee561
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains embedded JavaScript, indicating potential malicious scripting. The PDF also includes numerous external URIs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0264db30---kafavum.pdf In PDF document text
    • http://vipdiler.ru/files/file/sutafigagunureni.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/wamisoxepokodezesilef.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/nepuzijefoxebakisodetama.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/tewofu.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/robukugalosuj.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/65667081217.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/gabafow.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/nebuf.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kobegix.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/larisuroguwapugido.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/45054436382.pdfIn PDF document text
    • http://glassick.com/userfiles/file/36602497744.pdfIn PDF document text
    • http://ijfbn.com/editor_up/jilasutuxumisisagovaxu.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210919/files/20210919023723.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/kebavinatorejatulun.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fuvodumepagimurapozat.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/18273981924.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/27098415425.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bikusukezutizorivovar.pdfIn PDF document text
    • http://edituj.cz/res/file/46998165662.pdfIn PDF document text
    • https://cet.sk/res/file/detodisufizad.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/finigominiwusalesulubutor.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/vafowevuxe.pdfIn PDF document text
    • http://shurll.com/9mymyoldIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kudajadriyil+kudikollum+maheshwari+malayalam+mp3+song+free+downloadPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314031369609.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_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 17328 bytes
SHA-256: 6c2936261e7b74d2e08e36a1f696b873e1f1af87a9621aa763a8813d7a2ed338
font_01_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCC 11532 bytes
SHA-256: d681802cd25f2c1b7fd8db295db93c60944e33c68e92b43d42cd6ea80a4fa9f8