Malicious PDF — malware analysis report

Static analysis result for SHA-256 e461ade4bd3375c5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 22:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b943057add5cf6b2315926ab5d65dba SHA-1: cf19f8ba344d807b8131465eaf39b62dfcfbeef6 SHA-256: e461ade4bd3375c51197afe38f36a431f731a32361ac9986946e8ad2ab731e0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware landing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://allytemp.ru/uplcv?utm_term=john+gba+lite+games+free+download PDF link annotation
    • http://longbeach.ilovepokebar.com/uploads/files/38022166942.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/rojenonugivug.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/taziw.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xuwipiwaxi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/56176804028.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/gabixuranefab.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/foxowipuguminokisut.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/wazubutabun.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2a53d8685afc355e1035cccbd348e047/99331813070.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5e7e4d52b841f416591fdf99fa21ee47/lusiv.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/35211096788.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/40795754381.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/koruzavutubum.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/lekur.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/kozojidowulal.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/33127923144.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vedelexubonub.pdfIn PDF document text
    • http://nanopena.cz/upload/file/xafabaxututakures.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/42362889713.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109051047363063.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/93517702768.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/lubiregub.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zajazemugodupa.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/51910699650.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/vagupinifiwilalalijol.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/62649388307.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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 17984 bytes
SHA-256: d24b72e337f38fcfe85398460926d679698f3afc0774462d1f5972844d39f7af
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 11016 bytes
SHA-256: 426e2dd55a42cf7834afb1a1d178ec42d1a23b613edcb316b0f1ef0d3a164e87
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1