Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ed7ffe68ed5d7a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 12:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6b337ca8b89e1e8391e405ceb5dde4a SHA-1: 84cdc5d264a9620b649b272f97daff1777049fd8 SHA-256: d9ed7ffe68ed5d7a02e7bc3e30f98f1a6cc3e360369a1d839f33b3c8a6378d7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious. It contains numerous embedded URLs pointing to external sites, with one specific URL being a potential redirector. The PDF structure and embedded content suggest it's part of a phishing or malware distribution campaign, likely using spearphishing as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=subway+surfers+type+beat PDF link annotation
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/jedeton.pdfIn PDF document text
    • http://gestioniarmatoriali.it/xeferegetob.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/49574381317.pdfIn PDF document text
    • http://rrarental.org/upload/file/65625225851.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/fipevitemexibisuketotuneb.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/tonadakobarozijo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630588653402424267.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/73052215355.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/60396649218.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/12316514722.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/72435189674.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zeberusumufipirurolesizi.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/52131732696.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/84c2b2bd24a2efb6c0b2a4f3ec7f7a84/tetonoripikuxarijobusuv.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/minuveroni.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/84976626553.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/54696599660.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091413504480554.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/16388922834.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/jorifokixitetenivad.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/96406521124.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mozuxunadewidivu.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/pukoxumesiwizamanurid.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc7a1b0ba---mefobuxakodetesovezufofo.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/86999723439.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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 17468 bytes
SHA-256: a4b4c15fba98de71409215d251db29441263e3dac977be0275d0389dc8a6164b
font_01_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 10504 bytes
SHA-256: a50798ffe45dd9ab16e98cd4657a173422472757ebf646e01b8a92be667868d1
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1