Malicious PDF — malware analysis report

Static analysis result for SHA-256 1896dd24aa12f2f5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 11:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e8e5116bbf1a66f58d8164718e395bf6 SHA-1: 4e6ef97086876963649c71b235212a5d26b1ebc3 SHA-256: 1896dd24aa12f2f5429d368e42b547fc6c062ddfef6694a498c75e080e5a8b24
162 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of embedded JavaScript and numerous external URIs, many pointing to link farms, suggests an attempt to redirect users to malicious sites or download further payloads. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains text prompting the user to call a number, consistent with tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=before+we+collided PDF link annotation
    • http://de.ruben.pl/ckfinder/userfiles/files/13092142614.pdfIn PDF document text
    • http://www.bash.cl/media/file/84109099324.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/wemeve.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/putizomapabekeji.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/merugoxedeg.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/rimaduxixobuno.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/94151424760.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/xefuxex.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/47279728690.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161444f45212ec---10595193098.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/25158941445.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/sawonikof.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/rawilabenoverisodipapul.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/ximabitofulara.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/14968227057.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/99326455553.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vujiteda.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/nixuguto.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/welol.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/fodetativovuvas.pdfIn PDF document text
    • http://kim-clark.ru/files/file/sejam.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/47192889462.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89546165303.pdfIn PDF document text
    • http://vhktn.at/images/content/files/sodagoditevopebosaze.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_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 10076 bytes
SHA-256: 83425db475afcce738e8eeabecb909b879a47909631ecd5fcec8fc1352ea7240
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 18508 bytes
SHA-256: 0fdaa67cf2e897125ab13b81ba4d5b7a312b111114117db6b70de2e29080a655

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