Malicious PDF — malware analysis report

Static analysis result for SHA-256 027ae16567aa25eb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-11 00:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 866744a1dcbde9fe3b2b55b539c05130 SHA-1: 73c2cbaf39c3f0f19efe137904fbc9c6de7b4b8d SHA-256: 027ae16567aa25eb836ef7b8cafbddf98b3b7f4e4e54810be323eee1010cacd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence heuristic 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 PDF structure and embedded URIs suggest it's part of a phishing or SEO poisoning campaign, likely using embedded JavaScript to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://junona.manyel.website/images/uploads/medium/pumomagikekexinijo.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8d032b73---69655737038.pdfIn PDF document text
    • https://scalping.ir/data/files/file/faxaz.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/pekikof.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/37739712910.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/merus.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wijexenobugijiw.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/29900248609.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37315288907.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/45678334976.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/9447691357.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/kexokirusikivisev.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/zerakewusoxox.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/49241331188.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pezomavifevagetig.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/73942606848.pdfIn PDF document text
    • http://pk.mo/userfiles/file/60317023210.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vabevotikezoji.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/70206728582.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/kusomulijabaxowomefekut.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gagorefofi.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/xezedoposavulufiwoniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=7th+cbse+maths+book+pdfPDF 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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10728 bytes
SHA-256: ff1d2519d0e31a61b0461d5419ab72911447c48f42e802c00fe110fa56713448
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 19704 bytes
SHA-256: 0be3860228dbef6409bdc3c2dfe45f4ccf2e8a6ab3cae7c5d552b1df2ebd9954

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