Malicious PDF — malware analysis report

Static analysis result for SHA-256 65adfaee0c7935b8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 02:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06f9ca4e5be99017d3a18cd6a9156234 SHA-1: f55905ec4ea68e67a63748291c2df0d1be54e5c8 SHA-256: 65adfaee0c7935b839690dfc78b3b824baae9da3fb9e3c600a975fc315dc0844
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://infrive.ru/uplcv?utm_term=filhaal+movie+full+hd+new+2020+akshay+kumar PDF link annotation
    • http://cosonhuath.com/hinhanh_fckeditor/file/13129172244.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/61350401827.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/7464992082.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/minepamajudiviluzibivoxop.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/57375430100.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631045242.pdfIn PDF document text
    • http://gewald.ru/content/Files/8515095329.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/90919315849.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/jaguzajebavuw.pdfIn PDF document text
    • https://bem-sa.com/img/file/30032204121.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/35505911069.pdfIn PDF document text
    • https://gencatakan.com/upload/file/roraxep.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/54360234272.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/15134983504.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/kerilalijovozu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/36005721310.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6592ec2e---fawadofibegutanu.pdfIn PDF document text
    • http://secretinvitation.net/images/files/83359271477.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/81867279133.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/salisunubebewezivu.pdfIn PDF document text
    • https://nomortiga.com/contents/files/fokokasijodawizalukijitir.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vedipegawudazovoregiso.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_off0000b8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 16364 bytes
SHA-256: c4dc7c1f7b363cab1cab3fa884987faa888a40150d8b1756f9e00630ee11249f
font_02_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 11200 bytes
SHA-256: cd84285879eaedc1747ef6cda43bf8b5dbfc186806460c2511624250e36207fb

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