Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af90c4d962b84e8…

MALICIOUS

PDF

79.4 KB Created: 2021-10-07 14:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37d704da45dff0d5c5ecd982a8360eab SHA-1: 295aabb7f6198160098a35528ea6e65d327ffcbb SHA-256: 9af90c4d962b84e8e65820fd4f9891adc19b2fb1e89a864b9825eef5ad1bff90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://stowarzyszeniemalyksiaze.eu/img/upload/files/42895859007.pdf In PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/23183652355.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/besoxilakuparotuwe.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/grqukpn5el96c6qed1tln5abaf/bezisorezitojuvogixeraw.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/botonirosuwapuwap.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/59107803136.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210918_7EC9074604A6F46B.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3bae2aabce49c1db4452bab326a6c4c5/roperarotonilejexubewemub.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/velabukulimajebiz.pdfIn PDF document text
    • http://centronegozi.com/public/jasawatomukuviruzimivit.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210923/file/53701240204.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/selidudovodulupifonajonu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/41129991180.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/14668648193.pdfIn PDF document text
    • http://mayjack.com/upload/files/kozigupebuja.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/lijavegikexefap.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/55249461224.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/12699935189.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/82854538873.pdfIn PDF document text
    • http://iviltra.lt/images/files/58420784398.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/64522019292.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/9584928350.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/womunilulugikogebenoto.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mugazinivexemegememi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=baptist+ent+specialistsPDF 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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 18152 bytes
SHA-256: 13d5c3d97fcbcc9d7021e7ef0aca71fc1d7b60484e1eb7c4785e8c3967f7e041
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 10200 bytes
SHA-256: deb59109fec0ec2cd435a719fae16e701b1cfd916160645afed14d53c7d62a60
font_02_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1