Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3dcfe15735c0c8…

MALICIOUS

PDF

63.6 KB Created: 2021-09-10 02:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d665064b0c37bfe8654f21171a127a60 SHA-1: 86d6a240ef4b3d88974a78bd0fc530eeabd986a6 SHA-256: 9b3dcfe15735c0c8509494bbd6139124434fc1051c506a2a4189c03d094d160b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs and the overall structure point towards an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8532

Heuristics 4

  • 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.
  • 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://garglob.ru/uplcv?utm_term=environmental+degradation+meaning PDF link annotation
    • http://lachina.cn/upload/file/174212229.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/posoxi.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/lugafadojopabovewafigakur.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/17478826664.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/90081570534.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/wedimelotinidesivurivo.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/14309063172.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/25535952794.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/42624314570.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/60539133258.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/losizinesi.pdfIn PDF document text
    • http://goldmustang.com/files/files/likijavigunewino.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4a789a2c---92810910184.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/masubigon.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/46930639679.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/81998507218.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16310435021897129383.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e368cca5b---51181995746.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/pekazoluvimal.pdfIn PDF document text
    • http://screen.by/images/file/winajapitarewakigajubonat.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sarupa.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/88731687243.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/tekuwuvo.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/podawebidapudazuvofobaxix.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/tojodamimazo.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/memevofipokomabinezaso.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 10472 bytes
SHA-256: 83bf52b2a735e803109eec1b7d6f9eb76fe97dfaa7ce9a1f582dd996080fecce

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