Malicious PDF — malware analysis report

Static analysis result for SHA-256 a828287e49ee4c5f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 03:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 125401ee189bb9854d9efe5207ec9a47 SHA-1: 30a63e36a5520084b6d889d1471f582fcced6847 SHA-256: a828287e49ee4c5fd4ce8b54fde2836765e5878f36b2e17b5281816af463a67c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bluebirdcanada.com/FileData/ckfinder/files/20210904_F2964CFD35C79A8E.pdf In PDF document text
    • http://erago.cidees.com/uploads/files/xulunukem.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mifolub.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47755728198.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/23113444259.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/63004433632.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/jabexejux.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/sujuwisewoxizetatisow.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/28249588198.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/samuzigizemef.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/20739442900.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/89247473668.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d57523d5b01233996119b5584f9ad451/guxevomelobepo.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/lepox.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wawusopifitogopiti.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/bakoferivutodivu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/fununodatopodijuwotid.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogomuwivitulegu.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/59915991314.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/4711599292.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/12802787564.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903064556.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/33403855048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=roblox+hacks+to+get+robuxPDF 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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 17676 bytes
SHA-256: 1d4f7a8da91dbcefd2fcd36aa77a062f7263a872b9ad8ad75d80c851cd2b2749
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 10792 bytes
SHA-256: 696d175171c17a388da842b725aeeb290a51cc8ce1f287e6084d7773f8878948