Malicious PDF — malware analysis report

Static analysis result for SHA-256 304d4aadb7a6a1b9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 07:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c1af7b3acbcd087fdd154ae6bbecd844 SHA-1: b0f3eecb174fdfd758d9b051b90e78ac17857967 SHA-256: 304d4aadb7a6a1b9b0109a64691734c9ec5563c71dbb7ab91686ad3f58536227
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended for callback phishing or a tech-support scam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, hence the inclusion of T1059.007 and T1203.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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 http://thesciencenetwork.org/uploads/files/23615447130.pdf In PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/fasenotipepanav.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/fobagozonedebasog.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/13548008616.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132fce289721---sarude.pdfIn PDF document text
    • https://andhimazhai.com/images/files/jukatafodomadimesuzi.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/punajazixekegugogul.pdfIn PDF document text
    • http://pensiunea-escape.ro/ckfinder/userfiles/files/bopesinusugigafanedor.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/81343000442.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/35879839171.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_5FD845EA787DE467.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/41382571160.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/tifadugupakot.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/27229054704.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/dimetejonuzokig.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94543830845.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/18840333824.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/robolosa.pdfIn PDF document text
    • http://toonesk.com/upload/jetawumanozugutetature.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/wevekonidotoz.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vumoturezanomifaji.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/34593970139.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/zakigipafavinetuwuralaga.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/relipumukaxumu.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/gasorukafejetavafifuwumu.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/pajidiwaval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i9515+imei+repairPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16900 bytes
SHA-256: 7d0dd1842f1b5ef084e28f02ab8fb8ebe1379cbe742923ea69723646c3f04834
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10184 bytes
SHA-256: d571afcb7361b33f54eebf3223448ffa13965529c921de2b8fbf9187ff6f2089
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1