Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bca36c2d35b0ee…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 07:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d89d4b806b60225e1c2e446fbbbd8ca SHA-1: 85a992e3779cfbf428b1eed2143622799567e263 SHA-256: 39bca36c2d35b0eea73993650d70f1e94f7a6f497faf27d0387ed4ff9577a2a5
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a link farm on disposable hosting. Heuristics indicate a visual download button and a callback lure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=virtual+sensor+gyroscope+apk PDF link annotation
    • http://panda-es.tokyo/yamituki-n/uploads/files/3231104820.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f656b4e45---rumanalikugulutadof.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/71720054598.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/63120878389.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/64371833918.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/72515588719.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/regedakafanavozizureruz.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/dovegojidepitezalo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/58035416656.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/depijowaforafemidegezo.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/65836062851.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210916/files/20210916002227.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/sunudogejafa.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/30759451891.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/64870852384.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/nobanixokexipi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/69636143824.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/dosajaginafavirulazabaru.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109051926252869.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/80766193014.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/41156568105.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1h342kj5l4nv58skmo31bfh0s2/41094564566.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/31627489015.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/75424672675.pdfIn PDF document text
    • https://songhongresort.com/img/files/xazibarivarixudotaxi.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/9097832655.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10824 bytes
SHA-256: 29e4f195a816b10897439af874f955c5ba53a53f2e948c90ae5d1529d61bc2de
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 22420 bytes
SHA-256: 67217543e9b6e82e29025360732954a612860a182774dfe2d1131631e5f090ea

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