Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6d87ddb0422f1c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 21:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c31fb37ac9658e1d9a2406e915076cd SHA-1: 93f8c56472e68353764622027a8cf76932ede447 SHA-256: ba6d87ddb0422f1c3e7d088a1e99264ba7794ef32141e8256576334ff54d402b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, such as the one found pointing to 'coretry.ru', which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=tubidy+blue+mp3+music PDF link annotation
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/jizedadosu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kawulumomimekatoge.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/rulivomubepazegipeb.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/57057096255.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/96786332260.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/vuwunepibilalobegera.pdfIn PDF document text
    • https://fultoys.com/userfiles/52111160775.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/11926398209.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/21501084983.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/kezewedezekolijoxifino.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/38148860103.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/69298336572.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7e226c75---19826964833.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e94a73d9a---faruwujavonugiguxas.pdfIn PDF document text
    • http://egitara.com/upfiles/files/nomebapelowixakifa.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/numifedotogivuxejub.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vetifogose.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kunenilutujijapitiruxi.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/58366696065.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zisatinalejegufanuxi.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/susowebuxutorit.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/milifupodudare.pdfIn PDF document text
    • http://fitviewer.info/files/file/dipezadexuvesu.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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 10580 bytes
SHA-256: b095fd8dfc762c0cb9d49609578ddce12e9dd45342a46f146be8d8fdbc642973
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 17128 bytes
SHA-256: 2948f5c4dbf8742597192aa9da7568a73782a89980aa129c8d683f4c5f9a6650
font_02_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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