Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f1476e55682c79…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 07:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15c87059466eafd8e9c5e07e1bedf062 SHA-1: 15fce66518f62b5a3b38877eb8500f0a4830518c SHA-256: c2f1476e55682c794d58837e7a8846d839d0569ea89896abcdf8a5dafb5eb579
150 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of JavaScript points to T1059.007, and the nature of the document as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vanprodukt.cz/UserFiles/File/xenenomapajuvomu.pdf In PDF document text
    • http://flexa.cz/docs/file/kugafujevejimijesi.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/94980899466.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/55879151411.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/newofadizowikorukem.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/likaxomivo.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/67801093264.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/79843242785.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2iesq2c7c7chpgr5fi6opbm2g8/boweserozegipipuvesemame.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/966864612613633f9443c2.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/65854017870.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/10/file/20210910_075917_107.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/sukuzirabozotuzatibidet.pdfIn PDF document text
    • http://newshop.jp/archive/file/78301254133.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92370579074.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/45186060052.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b7e60067---wilufavukizinevoluwixaxos.pdfIn PDF document text
    • http://master-vin.ru/files/file/nopopizili.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/78192108870.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/20670927930.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/8430348692.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nituzozobatiridugusad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+check+call+recording+in+androidPDF 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 18140 bytes
SHA-256: 35526cef92f2f2865dc0ea7dc121860f0205dafc9772c600b51281bbc600024d
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 10648 bytes
SHA-256: 8943dc4a4b636abf714fccd0b94fa8af9109dd53853677e8a62a7873b0262afe