Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd64d907cd18990a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 22:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99da531bb102ba3272b43c5156e82b72 SHA-1: 625f7f58470759c4d52b2b2e6f446c48ad628953 SHA-256: bd64d907cd18990ab238c4e47617f5331f1cfd22f2965de0ac32340ed7e1815e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=broken+glass+hd+wallpaper+for+android PDF link annotation
    • http://sea-cruise.ru/ckfinder/userfiles/files/sesutekofululiwowogiraj.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/dosupivenugosejigej.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/xorolofunonaxal.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/pijejubobexebanuxu.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/65197646893.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/65836353164.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/96221717050.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/95053509147.pdfIn PDF document text
    • http://salkim.com/userfiles/file/niroral.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/lajufimutifafaxu.pdfIn PDF document text
    • https://festacontinua.it/public/file/pozadolivib.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/pobojopujavinem.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7e66319f6ecf586d8edded3409d4c67/jepimukatemab.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/45521505805.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/numokesakuf.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/56934880610.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/36857729777.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/56266b968d38bb10dd5af364d753ea0b/finigolekobasetalosopo.pdfIn PDF document text
    • http://parfumland.sk/upl/jafosuborevenar.pdfIn PDF document text
    • https://topupdana.com/contents/files/85883974838.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/48230644219.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/77742149410.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/sisikowos.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/95094057040.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/48329454967.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_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 17272 bytes
SHA-256: 0c71d674aa7246fa7e30233a62216c119e6a218e4d81648bb1d05dd66d3b46b2
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10912 bytes
SHA-256: d6a99216ff51ad1aff6805f0bad28b29769306c9a27f2023150ed00c7f9c5d2f