Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4329ce377f99bcd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 03:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d57cdb7d54b86e4e3484cc943ec11a54 SHA-1: 36f37a9c60d94c90a4eea1970f7fad7bb462163b SHA-256: a4329ce377f99bcd41857ecd3c320a90713fdf6ced894a6388d2383858b8e003
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable or unknown domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm on disposable hosting, suggesting a deceptive purpose. While no scripts were explicitly extracted, the nature of the URLs and the ML detection strongly suggest a malicious intent, likely to redirect users to malicious sites or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/41269436936.pdf In PDF document text
    • http://udokutscher.de/gfx/userfiles/files/73447442282.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/bakopupelanu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/19358437250.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/tixokefanuxapet.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/pazirefuronotomaj.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1783444688.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/62863608979.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/xujujixijojegegujujikew.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/80140898663.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/gubuxufok.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/6069929796.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/nupijukevadonukilobudebed.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l17cppu2bcm4uug7l7coujj5n0/fefolomofegufibajafegek.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/masanax.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/dowagevemamobunaruj.pdfIn PDF document text
    • http://hrudolf.com/userfiles/60492664221.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/lizoniko.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/mesira.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/70771589719.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/26521452539.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/fezesadopexibixanelaju.pdfIn PDF document text
    • http://fkhd.cz/data/img/46019196536.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/fidagejoripol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=love+island+season+7+episode+3+watch+onlinePDF 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_off0000bb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 10840 bytes
SHA-256: 24013cb70da65c0ba4c0c43dcd435cbff06cd91b8cd29f078e3c9157d87a7869
font_02_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 16268 bytes
SHA-256: 9d716e0458808b5e94cd88606e04031dc5fca28b55b0bb701d748391dbe935ea

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