Malicious PDF — malware analysis report

Static analysis result for SHA-256 5224b5a67d23fd9a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 01:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d42746058011933f779827a5795887f1 SHA-1: ae511dde6efe4d2ca1ea8ccc98bcd6471dad59ab SHA-256: 5224b5a67d23fd9a58c015bf41b44f6663505a5ab25ad93ad31d28d838deb2f7
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, a common tactic for phishing or distributing malicious content. It contains numerous external URIs, suggesting it acts as a link farm or redirects to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://al-wesam.com/userfiles/files/70827449252.pdf
    • http://drivescuolaguida.it/userfiles/files/39615308344.pdf
    • http://leeandrewdavison.com/download/63418625238.pdf
    • http://narzedziascierne.eu/Upload/file/wufexolixeloxusagok.pdf
    • http://chizclean.ru/files/fck/file/5023196509.pdf
    • http://sergeybazarov.ru/file/wobanopakexeriwaju.pdf
    • http://kvrhousing.com/uploads/tudunedugoxopadipog.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/pukuzuzevaluxarunogetebir.pdf
    • http://machin.kr/userData/board/file/rifawuvasedatexux.pdf
    • http://chemsdano.com/upload/files/41432537973.pdf
    • http://hastensandbreakfast.nl/userfiles/file/sifibizevuvanepilipip.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/lifalataxetovelifiposubin.pdf
    • http://iehyun.com/editorupload/file/96109037525.pdf
    • http://www.allatpatikapecs.hu/images/file/worasawep.pdf
    • https://ecohort.com/userfiles/files/desiled.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/kawarusubazexepukevajexi.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/28517111858.pdf
    • http://haciogullari.com/depo/sayfaresim/file/94323535767.pdf
    • http://mh-gartengestaltung.de/userfiles/file/xegojavipap.pdf
    • https://andrejc.si/files/file/33999774614.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f73fab10dd775689bea197f1abe7c689/bovelutuzederuvuziluxek.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/54739941036.pdf
    • https://maths-pdf.fr/ckfinder/userfiles/files/22324472652.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7c6975b---josovurekeravike.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=blade+and+rings+mod+apk+unlimited+diamonds
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec7.bin
aed85f18b66b28a8eea33b1c744ea43b6edbe27d0b5c0ed7df43320c3677cd40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 14048 bytes
font_01_sfnt_off0000d1b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 16792 bytes
font_02_sfnt_off0000e9cc.bin
06c54da65e8d3c48dfd3ce5f2777d6d52e89d621c96d4bbe7437ada0fdb79d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10980 bytes

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