Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c55dd226265afc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 06:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e3fe5649fd6719e3bbe38aecb20dda7 SHA-1: 0f306ab5ff9673b859f53007666a51edaef5d0ab SHA-256: 42c55dd226265afc7250d3b32861af5c0537ea1d2032e6a8c58dcfb5d6689671
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fresh-j.info/images/uploadedimages/file/61302768168.pdf In PDF document text
    • https://norservis.info/files/files/10182089586.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/goforedozes.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/88213323627.pdfIn PDF document text
    • https://advik.net/userfiles/file/46331783952.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wopugilevutixuzekawe.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/kofatumapeko.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sefove.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/90993684351.pdfIn PDF document text
    • https://andana.us/files/files/vajoriwupo.pdfIn PDF document text
    • https://virker-ikke.dk/files/59706657962.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_82597C0B716E00A9.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902191609823875.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vadolizodito.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///papenubiguseta.pdfIn PDF document text
    • http://inphilong.com/upload/files/89776166002.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/91907531897.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/52043175395.pdfIn PDF document text
    • http://guitarenko.fr/img/files/34199180162.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46690971567.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109161138069706.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/80700203270.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5cab4e7a---rebuxarun.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/nakodabeximezuneve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+stop+install+from+unknown+sources+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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 18588 bytes
SHA-256: 6b74066ac02c85a2012961577b9f7b717c600e0433d8b5910e143b3415bed936
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 11052 bytes
SHA-256: 872996064e35851fa2e460aefaf336f895ecb75e5bef63fb8c574f0670c03542
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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