Malicious PDF — malware analysis report

Static analysis result for SHA-256 753e647e1c1500b2…

MALICIOUS

PDF

62.5 KB Created: 2021-09-13 21:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c68e1f9b3664ac2d6dc4e8b05295f9d SHA-1: 7e57cdb7b0b0cd10ec348375c0eb16360910f113 SHA-256: 753e647e1c1500b2d7347d8b67932c0640dc19acad25bc7ef242779b876264db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to other PDF files on different domains, flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9091

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
  • 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
  • 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://catamma.ru/uplcv?utm_term=sandisk+memory+zone+android PDF link annotation
    • http://tecresconsolidamentorestauro.it/fck_data/file/43969535014.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/gomasanup.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/68119920934.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/lewaviforasasogiwet.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/tazixowam.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/24503816876.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/wefew.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837f7dcc04---49802618852.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/51119137473.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/57207574262.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p7se4glct5jbqidh9mpn4pn9di/ravov.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/13156573546.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vizobo.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/68770628042.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///56267617508.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/lotakeroxemeda.pdfIn PDF document text
    • https://magatek.com/documents/file/tefare.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210910172212.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/jipimigixoxuj.pdfIn PDF document text
    • http://geotersrl.it/file/patakugerawataluf.pdfIn PDF document text
    • http://tzsunup.com/upload/zekemirupegitix.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/81933650753.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/wafulebirudasanovado.pdfIn PDF document text
    • https://eventaipei.com/upload/files/53843616111.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/51261799232.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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