Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f4ca0b91ea05ac…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 05:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41bbd6a1150435cb3fc342e5597e1df2 SHA-1: 95519db5594049502995a11aecef58c1cdc369e3 SHA-256: 67f4ca0b91ea05ac7bd71a0d324d23543eaca149dc657e42a1f5eb67ed251c9d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=samsung+galaxy+s4+sync PDF link annotation
    • http://bouwbedrijfansing.nl/userfiles/file/moxijafufonenuzebafazi.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/5503119529.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gibuduvura.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/20695263542.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb42fcc021---xavuwafosejorunomab.pdfIn PDF document text
    • http://ed-union05.ru/files/file/67454795381.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/89421269844.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/25220933316.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/9988270730.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/73208154385.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/nozaju.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/58644508497.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/lejibefalunurojobowekusis.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/nijapefaxezilefuvev.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/mutipujovazob.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/92899109143.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142642ee301c---87881167235.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/32753109743.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/wijufivipev.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/2307636186.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/38731318003.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/xagifejubi.pdfIn 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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 17696 bytes
SHA-256: ffaa37f297866bfec6df64eb6eba36ae01cf971d9043b5c2c43c4a139058ea34
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10500 bytes
SHA-256: 916548480424a179791f7298b7bf4a5a85e7653e7e00f034355bf22244a9c485