Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6233c95f7731fd8…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 17:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e9f4ff77c8ec3a09dded44f2a4583f80 SHA-1: 860e94c5d1ad1394f8d0d2df22838b18b1008f64 SHA-256: e6233c95f7731fd80b343a60104c71b5a9ca091a28d66e01a287ccee3897aaf9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick users into calling a phone number, a common tactic in tech support scams or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ljjxmining.com/uploadfile/file///2021090916362549.pdf In PDF document text
    • https://0908108108.tw/upfile/files/2021/09/24/10787106776.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gibise.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/22144690610.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/92853366348.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b381917441---98690510090.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/70805367422.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/jonirivebukoxuramazekenat.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/zimijoxagilag.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5c752d8ee---jezexobemumotoxiv.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/vasiwetosej.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/derulilefitikup.pdfIn PDF document text
    • http://atya.eu/files/file/60345874535.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/28658025712.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foritoduwagab.pdfIn PDF document text
    • https://rais.bg/uploads/file/zukigosovitobusivixupo.pdfIn PDF document text
    • http://vuason.vn/upload/files/darukaduxi.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/94852461590.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/46484585547.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091015070997.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/naxugonok.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/68581795131.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/rokofaviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=powell+and+sons+drainagePDF 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_off0000b281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 17452 bytes
SHA-256: efb8b21fd822564ebe00b66ee0b879353582ad0c2e5f455284e9224c971959b7
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 10412 bytes
SHA-256: 7ebc6e9dd6edf880825262d857d1f906fbb13fa3eb3513af439c07bbea5222c8