Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8bf64c2c6f5101…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 03:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51aa0997485e2eb51652485ddd5b45e5 SHA-1: bdccc6834f8c3a98ad3844e8f838c2dd0746a4fd SHA-256: 8a8bf64c2c6f5101f73c074c5bd1830bdf4e8167f3895f9163edb49b7c2d7aad
166 Risk Score

Malware Insights

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

The PDF contains multiple external links, with several heuristics flagging it as a link farm on disposable hosting and containing algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=kimetsu+no+yaiba+mugen+train+full+movie+nonton PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2uu4rqgh5klfr7e69sb8vgqm4/1715489176.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/voxudufufopidevokagikese.pdfIn PDF document text
    • http://dges.in/userfiles/file/fajalewuvomajer.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vujaleruxem.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/77449949229.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rowojivawopidarug.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/zososaxojavikakorefob.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/19279501948.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210911061124.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/77642283944.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4587a15da---jiziwosebirefexipafir.pdfIn PDF document text
    • http://standdominica.org/files/files/tesofobize.pdfIn PDF document text
    • https://steammining.com/userfiles/file/81542675110.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/refaperasejadovuluwavep.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/dipulilusil.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xipiselobobibum.pdfIn PDF document text
    • https://efnnma.org/files/file/18592284094.pdfIn PDF document text
    • https://fratellifurloni.it/file/46342555036.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/54711603873.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/63334451302.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/borofixu.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/zuponoxi.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gapozukobixelakerixadil.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/surinufixodejufigi.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_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10968 bytes
SHA-256: 07cc666d4ae09652e5b33af6244b0185edec95e4d4c8edcd59f49631fbe7965d
font_02_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 18452 bytes
SHA-256: 78f86a50a6249edd1696bfbe0083fe4ebb642273ce017f23dcd128d65b9899cd