Malicious PDF — malware analysis report

Static analysis result for SHA-256 a668e15d4413c0cd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 14:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2871b938a3b065cf82a7b78b8d02c45 SHA-1: 86a9586f7d415169647b97ba62569b75393672c6 SHA-256: a668e15d4413c0cd360ba806fbae7740abaffd6ba9c66e95ffdf73b8278859ff
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the PDF's primary function is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=north+and+south+game+android PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b40999e944a4e0ab419d0ac987ade2e2/repokotefos.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/lesimalibimowoz.pdfIn PDF document text
    • https://medtek.vn/storage/file/66114022822.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/24680623853.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/woduzakaxokenavumiwu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jamadiruverevav.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/81453477626.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/31006384253.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/juletubareniliguzal.pdfIn PDF document text
    • http://alicantea.centralcms.cloud/galeria/files/65471120379.pdfIn PDF document text
    • https://adikmanis.com/contents/files/32241685599.pdfIn PDF document text
    • https://proia.bg/userfiles/file/72907294454.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/90419697344.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/54996267567.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/19746587161.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161443434af593---bugukewojikagekagadoxuvu.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fenuziwerivuf.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nujupuwedifipekeve.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/89314373450.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/93369060415.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/94352148865.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/mapisubejedeg.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_off0000b75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75C 16688 bytes
SHA-256: b96f96ff84d5df0d94b51b7edc95b2953f19f429d3719527739f2f197ed4762c
font_01_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10728 bytes
SHA-256: c1c95a9075f16c5edc6c744d96cada67eec05400ea46a3b4fd56a335f2784b62