Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dda4ee8687063c8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 01:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2781a9644a9d0486fb30dc9427020903 SHA-1: fd8157518cb4149d1a8370312663bdabca4b159a SHA-256: 1dda4ee8687063c8ce314fa1c36ff168b0167c903ba80c0fdd2d484e59b9d36c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates redirection to these external sites, which are often used to host phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pokemon+hack+roms+2021 PDF link annotation
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/boxojowisobirefurekavosoz.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/67331837458.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/80609977069.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090605570314.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/49741159672.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/rutinowimuw.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/27763544838.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/negovagunubori.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/serad.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/lefatibel.pdfIn PDF document text
    • http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/bokeririfebeluxinewipo.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/56769518242.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/4672618465.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wasinoxanaputan.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914175803_f9rvd6.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/43527079715.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/45713373351.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/54518838745.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/55911611739.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/nokesawexekozudewo.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gariwimotumuz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32a0cb0d---ruzetuzafa.pdfIn PDF document text
    • https://mar3ol.com/Files/files/kevaxofov.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/bemadowunexof.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/4nq28qj2teec3jn4igvoaplh87/ginomarikeme.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/82250339148.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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10648 bytes
SHA-256: 3095b5a168227ec09fd493919c2fa6330127aa1e3c23d51154a231df9800046f
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 18780 bytes
SHA-256: 950f82f057ef3131953e38a69147923c09658fd12aa5b2fadc69308504c1ffbc