Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05a84e374aa40dc…

MALICIOUS

PDF

71.9 KB Created: 2021-10-05 08:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc336bac1d36637827eb8285d82c212b SHA-1: 3573c50c6ad49fb2754f4a4b046b7946095054e6 SHA-256: a05a84e374aa40dca6cc10df12ff27a56d9e08cef3b22c1f29695a6cfbcbcb4b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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 https://wastran.ru/uplcv?utm_term=how+to+put+scans+into+one+document PDF link annotation
    • http://vinhhangvien.com/upload/files/81287764029.pdfIn PDF document text
    • http://rilta.net/userfiles/files/90053739932.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/79505223563.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/98006179405.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/24706892504.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210906205647.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/lowurivovuluganulonaxon.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/86194847710.pdfIn PDF document text
    • http://scsychem.com/upload/files/21343228175.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vokelejogi.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/73535537572.pdfIn PDF document text
    • http://zenithmetals.com/files/wavosiwam.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/24562700019.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nonusomewijizej.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e17857da3---wiroxovubinoxuled.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/nurivid.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/51349737092.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/wusixazidikuze.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/54796626511.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/vigubegolelire.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/7744645725.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/75055136710.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/51773100827.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/vesewodebupizasaduvuroja.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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 10708 bytes
SHA-256: 32368bdba7f50a3d9ae03b148ebfed5571106a5c945fba1e2ff890b14bc80627
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 15596 bytes
SHA-256: 5dd2bbf106f2419ecdd94c6e883e99d5a82437f4f7e06d124aaaad36985252d8
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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