Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05300fdc573e3df…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 20:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b225a8f3c7b89cb7ec93124e16babca SHA-1: 81c8b537498f1b6b9f241dc1f0d421baaaec506b SHA-256: d05300fdc573e3df0d57abc6dd3772dab4c2185abd071f59056f5b128daef5ad
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=adb+reboot+loader PDF link annotation
    • http://meuble-tunisie.com/userfiles/file/70641791246.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/38415761818.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/pivadejinafipi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335543cde86---nesotarusipewawa.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/15316042683.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/33006614969.pdfIn PDF document text
    • http://koddous.com/userfiles/file/vuvofobez.pdfIn PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/sewelafa.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/6790235989.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/24509535178.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/muginareguwodewofi.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/butevisopaginonabif.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/87468564962.pdfIn PDF document text
    • http://pnalog.ru/images/file/gikilafiburiwuregelovi.pdfIn PDF document text
    • http://darstin.com/userfiles/files/jagedanitawowalip.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/3120993413.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pojabak.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/wewidap.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/71998547266.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nozor.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/52083617211.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/zirefuwovafi.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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 18516 bytes
SHA-256: 7083abcdd44c72528761722994497f337dc54b87ad54a51e9673c17e50b547d8
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 9996 bytes
SHA-256: 9ebe5fc662b8357f1eef67aa7458abdca9daa1fdeeb95d0b57f6cdbc1be0ecb6