Malicious PDF — malware analysis report

Static analysis result for SHA-256 080db4178c255e6d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 17:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3e361cac4c1d04c3a1574996ad7647d SHA-1: 6ebfca9ad8092f8cf2acbc24e6b9cd76312b016a SHA-256: 080db4178c255e6d701122479865d9f4217fb287923b7d2f719b448b02bb2149
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=best+live+wallpapers+for+iphone+12+pro+max PDF link annotation
    • http://myflora888.com/ck_files/files/momekenipifafutovedopodux.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/36745555601.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/lutejefitudonukidizusimo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/60306168943.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28826082971.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5162f33d---jafuviwuwebazesomo.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/5750910995.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/dokejawadovizakerosujoxoz.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/kazawonumopevigipibivira.pdfIn PDF document text
    • http://skupka54.ru/upload/m/wanalonogozozagemoduje.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/livofen.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/zobina.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fepuxagozatazobuzugowulux.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/29968663982.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/buzopogimamunenugidem.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/pepemi.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/4636679632.pdfIn PDF document text
    • https://gangnampools.com/contents/files/87791903985.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nezokotowegipiweritog.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/87692435480.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_off0000ad91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD91 11100 bytes
SHA-256: 3b029d4bf6b5ec643820bedadd3766c4b579785141ce88ae4a8ef8d09f3988ff
font_01_sfnt_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 15828 bytes
SHA-256: 87b98ee6c76deba09fe1fed60bd7ad82d73500d251cb9460b1402b5cc3abd56d
font_02_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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