Malicious PDF — malware analysis report

Static analysis result for SHA-256 8320113e1cabce13…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 01:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 26a2ea68e809e394fa4f56671d49355d SHA-1: 9062f0b1df213f80cc5ed43cd42d506fd0ad4eec SHA-256: 8320113e1cabce133f2b10b8b22d0fdbbd01cdd0149c2466f20c56a5218023d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to lure users to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fasson.vip/images/editor/files/tojagamiz.pdf In PDF document text
    • http://xmzhj.com/UserFiles/file/rososebovenarexidobufamox.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/1928098741.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/50791250001.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b14008d4c4dc10f417c2fee706aa2ff8/tigepibupuni.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jilofufunipawakokonal.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/39566884600.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/zarewudiworowojeli.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210912030234.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/25330129417.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/panuxopaxetaloliwulano.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wozasaz.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/vosozaxuzamufijize.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/nawuxatisuvomogaxewi.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rewegupiliwo.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/pilinerodewoxizawusunawu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f2f8110766dba0a024c0c9e169bc9222/86620203601.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/54897757265.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/99810148723.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/25356122181.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zenekugoxivano.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tifaximewilizasa.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/tegid.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/gudemikipinigedaten.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tilufidube.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/40724035684.pdfIn PDF document text
    • https://birotex.rs/images/files/jajak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=put+cinema+hd+on+firestickPDF 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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 10888 bytes
SHA-256: 28debcfe5cd04cd84a7b5a53e3741d7f2e5ba2f6402e8ad53711142955e0abd3
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 18264 bytes
SHA-256: b18d4b0f09f8ac23e540b3ea5a8195c65add8ecc8c02b90e6636757973497c00