Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbedb6b3266992f…

MALICIOUS

PDF

76.9 KB Created: 2021-10-07 03:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 111494d1db322f171e770bca2c19493b SHA-1: 97562f56850d21277ecfea9e34d1151e2258f9c2 SHA-256: 3bbedb6b3266992f69e0f8f6110190719178bd9034d59b534e34f4a494fcef01
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to prompt users to call a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of many external links suggests a potential for downloading further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • 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://laborke.ru/uplcv?utm_term=the+seven+realms+series PDF link annotation
    • https://hw-power.com/uploads/ckfiles/files/614eb3020746c.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/93694825205.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/47025036355.pdfIn PDF document text
    • http://geodez.com/pliki/file/rajijinoxobog.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/duxatovamogo.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/17503270094.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/49c717a533c2b4e5e66847afb9dca2c7/8660583515.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/dibafefejatinit.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/97217129729.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xejusabixunudilepis.pdfIn PDF document text
    • http://teresachild.com/upload/files/dilivewukupaxizomig.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/4714756488.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/nasudubowanefepinidefibi.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109072007512895.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/19741634666.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/sorozugokinosogupijinu.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/46108903108.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/47423518510.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/43212276093.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614a18468e89a---73318777952.pdfIn PDF document text
    • https://parkettworld.com/upload/files/33945485189.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/70222223030.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/pijima.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/9026168424.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///93194568032.pdfIn PDF document text
    • http://snsi.jp/image/news_file/burisavuvigobufasoruwo.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906093815403.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_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 18292 bytes
SHA-256: 9d8f1538ea49e62eb2a3d7be34008c1b6b3dce7d93fb077ff90f1eace7bd5003
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 10184 bytes
SHA-256: 5bc0c83443b627c89971e88fa2bd575fcab8d84f6c5fc8c8a6c199575cf04c69