Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b3ba8b97cdd1a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 01:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48102e4069787e534468ccba261d08fa SHA-1: 31f1b05c3397419deb976823bb7a6e68247a2ad0 SHA-256: c53b3ba8b97cdd1adb3a95ede54ba0d69ff8f98e480c322c6033affbfc8102f5
66 Risk Score

Malware Insights

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

The PDF sample was flagged by an ML classifier as malicious with high confidence. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://ketchas.ru/uplcv?utm_term=filmora+x+pro+apk
    • https://conexkarvan.com/cache/fck_files/file/58824965337.pdf
    • https://fishboat.hr/files/sanixedaja.pdf
    • https://matricula.arendic.cl/files/lijeliwasurigapibix.pdf
    • https://marupyara.com/fotos/userfiles/file/luzen.pdf
    • http://showpalmedical.com/userfiles/60442403295.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131705b2e4b7---5436741067.pdf
    • http://duszek-lasu.pl/userfiles/file/wefejoboja.pdf
    • http://nowyhotelik.pl/userfiles/file/77395265208.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_F403D62491E714E5.pdf
    • http://scantech3d.com/files/mejirowavinaros.pdf
    • https://netkat.in/ckfinder/userfiles/files/gemoramewafeka.pdf
    • https://cpsguffanti.com/uploads/file/rodolezuvotod.pdf
    • https://www.stnedu.com/ckfinder/upload/files/perivopelupojo.pdf
    • http://houselandia.ru/files/18334710025.pdf
    • http://metall-press.ru/files/donurewixalisogefipuji.pdf
    • https://ville-saintleonard.fr/pdf/zilevidarebamabuvofi.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/93106917452.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/56625262953.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zixogusudu.pdf
    • https://suacuacuontoanphat.com/upload/files/notutakovis.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/24581637008.pdf
    • http://farmaciacogliate.it/userfiles/files/tagotekipodexamujadok.pdf
    • http://gibisch.biz/files/files/83224134624.pdf
    • 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_off0000d847.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 16792 bytes
font_01_sfnt_off0000f05e.bin
112a947e865ec6e64a1fc951c8a67871e573e744162239e32f4c98734649868e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10084 bytes
font_02_sfnt_off000106b6.bin
33e8be2fc30edd595fa6c3c573b74d997a444389acccf8d98cffe602b152ea32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16716 bytes

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