Malicious PDF — malware analysis report

Static analysis result for SHA-256 78454da54c39f620…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 23:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c940c0c3ebdc08efd0f24f3342e74027 SHA-1: 633a2a244e0a72ca5460a3bfc10de943b4dc1cf0 SHA-256: 78454da54c39f620badbea9156d37f21af69d0263c5b59f09d67e6f3333e7add
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The embedded JavaScript and numerous external links, many pointing to disposable domains, suggest an attempt to redirect users to malicious sites or download further payloads. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, where users are prompted to call a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://someteme.com/archivos/_20210901230122.pdf In PDF document text
    • https://questyme.ca/userfiles/file/zezadozeduriwitid.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/vipebamewosomuj.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/sigepunas.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/gokudimofiwo.pdfIn PDF document text
    • http://immopolignano.lu/images/33508840359.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/fanujeno.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/bulipefiru.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/70835365323.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/zasox.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/sesukiwor.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/taxaditonikilixop.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zufenopematafoka.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/jumeji.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/lonozexekovapiza.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/wafasegopugulilevesada.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/madize.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904202512847175.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jomiterin.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/78768439024.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/23260315391.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/nakebe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405824cf34c---pikanijile.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/8215489808.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/renujewaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clumsy+ninja+mod+moneyPDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17392 bytes
SHA-256: 1d2412242005383fa2055328a60862e17c57177cfe5d48871a9040c686446c8c
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10584 bytes
SHA-256: 1cce2e03fbf389ce2e8d3867686c0cb4d4e327d5e5c682b67b7bd697b6360f1d
font_02_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1