Malicious PDF — malware analysis report

Static analysis result for SHA-256 234271b196703f18…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 16:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81bba97acdc239c5782e6fcab4c4f100 SHA-1: cc4770e106ed69b33e8463215f6509a72d74238d SHA-256: 234271b196703f1820bd02a7860025f9e1c37fbf040555efab7ef8ac867d1df6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The PDF structure and embedded URIs suggest an attempt to redirect users to malicious websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=multiprocessors+and+multicomputers+pdf PDF link annotation
    • http://koyomisushi.com/uploads/files/92882543655.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109070759599191.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/8150658924.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/95043246499.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/gonitixonafupetofuden.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/73081662116.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/23008365321.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/watig.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/benisegomakote.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/53085551224.pdfIn PDF document text
    • http://cwesp.biz/upload/file/vireforedebexu.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefobupaguvokosaruj.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26789839685.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871a48a58---titalagosi.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofuderul.pdfIn PDF document text
    • http://synphabase.ch/upload/file/sudegegudukatunugole.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/51535681663.pdfIn PDF document text
    • http://myredm.ru/uploads/file/68607652330.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/kurireridisotexudosotad.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/folisigariroxax.pdfIn PDF document text
    • https://agrando.cz/files/file/vupuva.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/39479126090.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/fubinumag.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojebokozurosobavo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b537dc12c---piwujixojusobaxofenojev.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45213811892.pdfIn PDF document text
    • 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_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 16596 bytes
SHA-256: 002ad5ae9a0cdd50a1fea3bae6ab88b6c3140611ab2f88231f2572d9e759a156
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 10876 bytes
SHA-256: ebea93a917efda6be632942f04514f07648ab7ad55ef7b3d3e2bd3ed0dbc9278
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1