Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c074e29610f824…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 10:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 821c609a78028fe2a099c97d810b9893 SHA-1: 981d49cfa521a9162370b0c167062a1d0a8c9250 SHA-256: f8c074e29610f8244e17fb8b19ca0c00b343bbaf906648f35387212d0877bdde
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms and redirectors, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_CALLBACK_LURE' further supports a phishing pretext, likely related to account generators or similar lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=fortnite+account+generator+v2 PDF link annotation
    • http://arenabilardo.com/data/_files/bedilonofo.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/naluzolekezelewore.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/sarawekuzat.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/pinim.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/44342712537.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/zategukanotatido.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/ribuwipimajad.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/61970553216.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/88358532780.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jakaribeganakuwuwibuv.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/gegiwajesogewesuza.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369377e3ebd---wanazakifeluwagibazowag.pdfIn PDF document text
    • http://abwva.com/uploads/files/14875877777.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/91857344302.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/kuxisolivafagupoxemu.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/regezekafef.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/39877895516.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/fumonetesape.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/62403479481.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/44921890995.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zegazofuloduguripevuxinu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81c54dc94---17871763992.pdfIn PDF document text
    • http://erictex.com/ufiles/files/21671035743.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/vuzanuxupisox.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33267198116.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_off0000bc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC55 10452 bytes
SHA-256: 96d8bc5feab6f6a06c9ed7530b3d4033143c7048f5e634a71da0adaba8e7b5fb
font_01_sfnt_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 19236 bytes
SHA-256: 710b3666f7ee5150dd74d72a5fa2442e8850a42913b586a9f5b7c0f0ba38a128