Malicious PDF — malware analysis report

Static analysis result for SHA-256 78727544b0bdbe76…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 02:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40000b2ed588b8eaf9f12320ed648036 SHA-1: 99683eca5f3274c1b36ed695255d6d8b51f6f7bd SHA-256: 78727544b0bdbe763c59a797b7124b3da544a9174cb31cdc64d4792b3e44dccc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external URIs. The heuristic 'PDF_IMAGE_LURE' specifically indicates a screenshot lure designed to trick users into clicking an action trigger. The presence of many distinct, disposable-looking hosts hosting PDF files suggests a link farm used for distributing malicious content. Although no scripts were explicitly extracted, the nature of the PDF and the numerous URLs point towards an attempt to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=mi+a3+root+android+10 PDF link annotation
    • http://isystemlab.com/admin/ckfinder/userfiles/files/66478928416.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/pusoxadezawomi.pdfIn PDF document text
    • https://kudusde.org/resimler/files/rugogid.pdfIn PDF document text
    • http://topp.pl/_topp/file/42854907946.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/2053986815.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/sonowubinazozoja.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/64790865282.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9b128fc00a16f088927d01ce46ac13ed/81292494424.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///26248633386.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/modupozepuxizamejuwusuv.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/96332239445.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zewap.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/tewutasojix.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df74b022ee1d3a98afcfdb5725411cc2/zegutowapo.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/borelutivalisamelere.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/gapiwerazojakodapama.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/81396984870.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gawamonanezujuda.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/36980688070.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/46153173665.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/11859048671.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/bebepajebapudorifa.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/10439252872.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lanijezosuxenos.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/pepirobamazisilamix.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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 10232 bytes
SHA-256: b87f7027ef962d6e124d20ab83fa9369f02e6d1e300eb2f56378f6c26f36bd33
font_01_sfnt_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 14368 bytes
SHA-256: c92db93c740b75b3ce83df6d70d88bcda56cb751bdaa3e3bebc8edd7ee9d4f5a