Malicious PDF — malware analysis report

Static analysis result for SHA-256 946c9826a7377fc5…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 21:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a99f47ad0456931e3ec57fe9180b2b7 SHA-1: 54d36d3f09123baccd7bd23d00a19a9352f778f7 SHA-256: 946c9826a7377fc53694ba68de87508b23fdaeafc3b79d74293e9d63254a3bbe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm, a common tactic for phishing or malware distribution. The PDF contains embedded JavaScript, which is often used to redirect users to malicious external sites. Multiple unknown reputation URLs were extracted, suggesting a broad attempt to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://eros-arena-reutlingen.de/eros/userfiles/file/98863927041.pdf In PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/51625129268.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/79595290766.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/tawuvifo.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/degekuxasapu.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54139321343.pdfIn PDF document text
    • https://kuepancong.com/contents/files/36267064943.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/medijobututosubenotokafo.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/84900672952.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/naremoxujiwopezadonojigi.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/vogogofomiramulimulalenef.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/63674429627.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/tokagubada.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/zegelapam.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/49637535254.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/11911367028.pdfIn PDF document text
    • https://blugarden.eu/file/18237794396.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36521335844.pdfIn PDF document text
    • http://keitbg.com/images/files/35938282873.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kowobavirorur.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/xizinimare.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/61805293697.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a6d567f5---vivufabawuwulutupi.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/368515986.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/63862447548.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/92562269372.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/75591250148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+android+app+templates+free+downloadPDF 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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 10796 bytes
SHA-256: db90c1c272f7e321c3e54e92acf1b28bce4837430aaa92d561f4e287ba462d69
font_01_sfnt_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 16828 bytes
SHA-256: 721236606b8f3313dc5183b86e3c3e964c28b709fba820a612d662bf83fff281
font_02_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1