Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d63f22b6d0b76e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 139c88645b96271c9a0a1d1a8596b8e6 SHA-1: 64c6d9a651a8913d5b7656bd6fc9b78b400c4449 SHA-256: f5d63f22b6d0b76ecddd84f5dbacea8863c142dd3b24733b166ed2f0372672ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://immsac.pe/sgi_userfiles/userfiles/files/63335572898.pdf In PDF document text
    • http://carnow.jp/js/upload/files/63975741180.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/kimipuwakigu.pdfIn PDF document text
    • https://datajournonepal.org/files/vemepipizejuwofasij.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/zixumesuwiruvunik.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vidozenapazexil.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/xiderinigezanofuvozado.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/vosipobebaniwanukoxafe.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/kagenuz.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/23261457971.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/79478760430.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/720399927.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136715500113---xisixisotukekaxaxifegonu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/luximulagerimokek.pdfIn PDF document text
    • http://gazetavk.ru/img/file/tipazi.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/nazuxanasesigavuxosadomu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/ridabodikefimafovipeb.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/nagojodewosobulijav.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/gutarezifamexorexebupow.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161405d6441bcd---66014997812.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/waxuro.pdfIn PDF document text
    • http://calisnt.com/uploads/files/20191540896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=multiplayer+mmorpg+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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 10772 bytes
SHA-256: 40da4b85188419c97f2d6bdda35d335c84d9d160ad6a2940d58da6319f459f32
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 17936 bytes
SHA-256: 8e20bf41046a2f2d43724e0c6694e3b5b148e8ab85037f6de0ee425eecaa09cc

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