Malicious PDF — malware analysis report

Static analysis result for SHA-256 162d823b3716a92a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 02:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17ba2006bc26a86b78fef4fb33f84974 SHA-1: e0e9d8b2457e0fc75aff68972bbf819412717547 SHA-256: 162d823b3716a92aaab304b2581775409fabb980fbfcf2e6c764d343d8c5c35b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. Embedded JavaScript was also detected, suggesting potential for further malicious actions like downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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.
  • 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://vespaclubcagliari.com/userfiles/file/gupisagiranepu.pdf In PDF document text
    • http://linhkienhunganh.vn/luutru/files/67444927120.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/juzugofikovekomiwese.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/32468274731.pdfIn PDF document text
    • http://telecycling.info/files/file/73818428185.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/11446999915.pdfIn PDF document text
    • http://riph.pl/userfiles/file/36326293789.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/dodafejebevagumizuwudu.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/pinenevojadozokiwek.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/53893017413.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/nodoluvaluzon.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/kajiwebufo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/efce20f48801fa2b6b9f92ec28a5a9e2/visolalimegunopisona.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/10357890331.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/kunumotekunaxesa.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/lonodesefuf.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/92657064118.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210909_F9926F739AABC05D.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/51657953950.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133615f82129---55980900239.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/44316641623.pdfIn PDF document text
    • https://penzion-palice.cz/content/59383534704.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/sajikomixeliv.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/25812069167.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dubegogoborosado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=logiciel+android+pour+pc+gratuitPDF link annotation
    • 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_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 17708 bytes
SHA-256: 5d17be24c477c0589fed918325ba415d1e4b7968ea38ef66b83fae01fce9ec16
font_02_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 10580 bytes
SHA-256: ecd66c29c73eca35f7aa595417a6f8d0d7d69aaf119a8862dd8b9e22932a38bb

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