Malicious PDF — malware analysis report

Static analysis result for SHA-256 0417a19e1f932d3c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 00:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87e4b3d41b4d98811c1a37b8b72c87f8 SHA-1: a9473299dc1649ec929ebe548589608d3569075b SHA-256: 0417a19e1f932d3c60eeb9f13022b2e52dc8335a8323a55981c402129402102d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document's purpose is to trick the user into calling a phone number, likely for a tech-support scam or fraudulent billing inquiry. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://hsiaoying.com/userfiles/file/46124574573.pdf In PDF document text
    • https://dyaa.club/uploads/file/1756583656.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/87693537024.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/xunufusabanos.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/xanosul.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/30290505311.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revagiv.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/69485865678.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/sirefukuzi.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povinuwije.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147337b24433---zaxod.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/58624492267.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/milalexazasa.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/37255337940.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/risikevotij.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/21363322806.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/rewaz.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/delazoxabu.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/82621195700.pdfIn PDF document text
    • https://fratellifurloni.it/file/48899064138.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/35674687112.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/25024816365.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/57294971391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=where+can+i+watch+moulin+rougePDF 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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 15072 bytes
SHA-256: d4950c8acf7a2a20cde9ce1508158018fd3a090ef839f163b14727849a699785
font_01_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 10688 bytes
SHA-256: 8241e09d925b21a351ef6f350a9b8ad608991b2da5256e9488e3969ca7012624