Malicious PDF — malware analysis report

Static analysis result for SHA-256 370b24f7d3d07876…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 00:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7c57e418ffda2cd41f584fd2f8b40f8 SHA-1: 33abfa6e5b738bba9c3203311a39e243ea43b581 SHA-256: 370b24f7d3d07876f8dbed66113d16ecf2b3469112cc32b4360bd8f090d72959
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and external URIs, indicating malicious intent. Heuristics flag it as a phishing lure, specifically a callback phishing or tech-support scam, by prompting the user to call a phone number. The ML classifier and ClamAV detection strongly support its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=recover+contacts+from+old+phone PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac2735809---ginitetaditon.pdfIn PDF document text
    • http://imotrading.com/images/userfiles/67146987730.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/22852833944.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/sixarugubetudimoxoto.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/definirupawakil.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zemefofugilaxuvujoxewa.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/37169550562.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/52871226526.pdfIn PDF document text
    • https://togeltop.com/contents/files/gewaxoluperotetodaku.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/remojamofaxudorotosepi.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/dafibazelipitubonef.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/moradaxamivazi.pdfIn PDF document text
    • http://prestopc.it/upload/file/pitoloroguxutevib.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/vezibovalox.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/10200777987.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144662bad750---16260351534.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/lasaxibisetabanemuj.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/9854913267.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxedopumedokubulevatafe.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/jebakusugunukemuposovufup.pdfIn PDF document text
    • https://armenia4d.com/contents/files/86368741137.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/vusori.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xotizikimuv.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lefofizaluvapapanejeb.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/99019228423.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/zepufoti.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_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10904 bytes
SHA-256: ca9f78d6177996bc7685006dc2bfb33263d7f5258de85a60ab78c43093c97495
font_02_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 17260 bytes
SHA-256: bcc14fdba7aad353e7feb82b48c683d619c4089ffd70aa7fb08578ddce7589a6

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