Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be5eb72f9342157…

MALICIOUS

PDF

90.0 KB Created: 2021-09-15 15:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9064349c0534f3a302a15acfc7a5434e SHA-1: 62cf97a71d9ba327e66d9fd804ef66e7b76d46ab SHA-256: 5be5eb72f93421572959add1f80ba1975dce0cf4b4edcb1959a1ac966dd88fc2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of embedded JavaScript and external URIs suggests an attempt to download further malicious content or redirect the user to a phishing site. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=oxford+english+placement+test+pdf PDF link annotation
    • https://sport-jicin.cz/dokumenty/dutoxajiwu.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/zezilivawosimiwofu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/69573235999.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/kigafaxasu.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/jejukisudolizadinitodole.pdfIn PDF document text
    • https://cian.hr/userfiles/file/lifute.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/85157059934.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/golijejunuraderatevusalis.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/26368358294.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/gedepotaboxexaxokug.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/2627787476.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/gatigerokuneduladi.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/37767263269.pdfIn PDF document text
    • http://montesantangelo.it/files/files/vufodofob.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/todud.pdfIn PDF document text
    • https://mytopics.it/uploads/file/rukiligitagowis.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/89264158849.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/zewifo.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/84568672595.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/vesusodatewedasutapa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139f80e4d642---meneguzalexumozimokulegef.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/47de56e09a974aef902a0cce1c903825/6982153558.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/62876680585.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/lefenesezene.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/57637105234.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_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 19272 bytes
SHA-256: 0b9f0b3763d85e775e2a708b8987e8788c8140b9889e200f8247aee7d261702a
font_02_sfnt_off00014056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 11196 bytes
SHA-256: 679544cc55b0129fb5b8ed32e2a4d5eec7d81e8bd69ab2aa80f8fb517ffabe47

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