Malicious PDF — malware analysis report

Static analysis result for SHA-256 350b956e1f24cbab…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 11:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28abee092384b2f28033277ed016a7b9 SHA-1: 07d3718c995344b520f5b5fe4695650cb2c013c2 SHA-256: 350b956e1f24cbab3997072157627cd2787438e6072d6030733097cbf57e6d52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=amiibo+spoofing+android
    • https://www.sterlingsez.com/ckfinder/userfiles/files/81079818290.pdf
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/jovaxovi.pdf
    • http://orsini-blasioli.it/userfiles/files/sofudexekazajufulamarube.pdf
    • http://asja.ua/userfiles/file/refevug.pdf
    • http://krakow4you.pl/krakow/files/33688212946.pdf
    • https://borgopitti.it/userfiles/file/79132255083.pdf
    • http://automotiveenergy.cz/userfiles/file/xifopofuronuza.pdf
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/fimimimifapezaratenovez.pdf
    • https://la-klamm.org/userfiles/file/keponenisolakiwiberuvumu.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/lidexavetefutul.pdf
    • http://mistral-paints.cz/userfiles/files/83773201155.pdf
    • https://nanyangtextile.com/userfiles/file/35271821002.pdf
    • https://madeirashopping.com/userfiles/file/webet.pdf
    • https://edenestates.com/ckfinder/userfiles/files/jivejotawuw.pdf
    • http://cmtl.in/uploads/userfiles/file/file/93683959959.pdf
    • http://dayou.tw/uploadpic/files/202109051457256984.pdf
    • https://sankaibearing.com/userfiles/files/22716105431.pdf
    • https://nieruchomoscikomercyjne.co/files/file/77569033357.pdf
    • http://centronegozi.com/public/tufir.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/januzikerav.pdf
    • http://vkts.se/userfiles/file/16491073174.pdf
    • http://vivo-mebel.ru/upload/file/12673055487.pdf
    • http://banghetretunhien.com/media/ftp/file/3058949240.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/62419232319.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02cb2eb86---88416816345.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_off0000b145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 16792 bytes
font_01_sfnt_off0000c957.bin
ca6f6ff5412c0571ff96f41cbfe55712af12d295ed6a1e788037ba9fed924a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 16628 bytes
font_02_sfnt_off0000f391.bin
adf139ddda553c23a436c9bc92179164dc7cff65ecff8a20654cafa9dcf6dc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10684 bytes

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