Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b8924f2e60fb72…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 22:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb97a3e8ec04ae36ac3c5703348eb31d SHA-1: 0f6e5c2e8db3e8cf3e16c854b8b5b259cbf1f11a SHA-256: d5b8924f2e60fb7213022c07ea9c1c5e0192e9d274464fe512912ba2c7d69bec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on potentially untrusted domains, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=ejercicios+de+gimnasia+cerebral+pdf PDF link annotation
    • http://vnos.vn/app/webroot/uploads/files/pofigolumenulolen.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/17458077342.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zabalem.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/xivifuf.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/32938710737.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/linevelafejali.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_060311.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/63160579238.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/19033189716.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/buzopogimamunenugidem.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/rebobesajivufatopulutino.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/44998117244.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/50432407244.pdfIn PDF document text
    • http://www.siposferenc.hu/html/90739723788.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/57263231185.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/37152991002.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/kilemejesiligevifilak.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/79704498093.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/90073292910.pdfIn PDF document text
    • https://kiptep.ru/file/garivikukokepikikewilowo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/40013616699.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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 17756 bytes
SHA-256: 10b311f3eefc639707b58659a37c28d2526dfec72c725b8797e39d0508663444
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 11116 bytes
SHA-256: bbfdf0b60e1947e2d1d0a9b7c93c647268dcbcd3d554e9f78ace57a4c89695be

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