Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aac5dbaf7b3cb12…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 19:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8ec713af0a3b251a0c5d0701fac63fe SHA-1: b921ee11404030926490e75e82b237a5ca264c5d SHA-256: 1aac5dbaf7b3cb121ea315fb29aaa789ba1352d200361bf91fc10b61c492985a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The PDF also contains numerous external URIs, many of which point to disposable domains and appear to form a link farm, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ncvpte.in/userfiles/file/sawikimevosus.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/68407518300.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/xedolog.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/dugakiwipiwemejox.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/kozobejak.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740b4923ce---92735130318.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/salizegipawavemewafeku.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/lidaraz.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/sedorimemudidirevet.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rawuxelebavuseg.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/nerawof.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94543830845.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/12018409319.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161379dadc00c6---polifutefujomamurimemo.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910205031.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/36287184408.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210910_70778E94DE2F05B6.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/309b190b67e58d8330641fcb22722cca/84645868044.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/15326893572.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/riwawusopuk.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julipumuxovomusekajelo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/besuratojelixibaloduboju.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/tituzadegoriximot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+hundred+book+pdf+banglaPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 17656 bytes
SHA-256: b3111028a8b52d2d9336bc7dd97cd79b43450a6bceb63f37ada4de79dd7a511c
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 10712 bytes
SHA-256: 6a1c813eb505a7a545a1fd07796c79b80a8ad9d717aeda3ce68ea4e79e362a27
font_02_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1