Malicious PDF — malware analysis report

Static analysis result for SHA-256 455340ebf9d6065d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 04:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6e1a60890f90e3ffa9a6a7b7249f953 SHA-1: 164d8088cd775a73c3aa74ba0b7f247ea044cb9f SHA-256: 455340ebf9d6065d895464e45b9d58107eddcfae0ec8ebf32b86e9353c29d6f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=android+stabilize+video PDF link annotation
    • https://blugarden.eu/file/53636364930.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148147f16c73---bamipuzotuxujaker.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210903162657.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/2192325821.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/jinuromuguwixukuzuliw.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/64312699098.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/72498252824.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/19374333734.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/89273475500.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/75147336731.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/96923276347.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/kugilagemigojazeto.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/petidukebovakubotitox.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/wisafesisog.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/panexatefabejamobubar.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/24013750315.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/61126974263.pdfIn PDF document text
    • http://ipceurope.com/assets/file/95292067293.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/8582350723.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/34312109470.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/12400612304.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148603f950b8---2279629933.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/vewofi.pdfIn PDF document text
    • http://pasted-radio.de/web/files/wazugimezebidurupabotonok.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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 15500 bytes
SHA-256: 6a4351eb636afcdfd8782ef89ccdca497132e8470d9c83c830dfdac6c7003925
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10488 bytes
SHA-256: 64c97ae903f57065448000169f63b74aa05485f39537cc3b473a6e3da2b3dde1