Malicious PDF — malware analysis report

Static analysis result for SHA-256 5766b74a2194fc30…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 04:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec41a964962904677cc40a7b7279f43c SHA-1: cef4d531a2756fe3cca02d7ec53693603ca15e14 SHA-256: 5766b74a2194fc30a78a9f97ded10a4f21a80dd96eb598075ebd819824542286
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or redirection attempt, likely to a site hosting further malicious content or a fake login page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.papelerialapiceros.es/ckfinder/userfiles/files/tepafevejamumije.pdf In PDF document text
    • http://jingyilin.org/uploads/file/49766041448.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/gopezazakobasasesad.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/tagovovebogonudibokizemo.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/wapuxivuratakot.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/59957696198.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gevizi.pdfIn PDF document text
    • http://portableandcool.com/files/files/4792875475.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/41697910450.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kazenat.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/kipibugixoxenofinemufu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/63690859346.pdfIn PDF document text
    • http://moristas.com/userfiles/files/25034539920.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sumujok.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210917020645.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/68086049882.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99604093117.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210909_768481B54380B118.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/73738359985.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jowaxekuwiwi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613605966d261---suvidopujobus.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/digewapa.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/neveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mohra+movie+onlinePDF 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10164 bytes
SHA-256: 62f4edf931160fe81ab30ff78b8b45dda38bb14cc5ab36c04a11ead81820421d
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 17456 bytes
SHA-256: f36d640c6aab46c11c514175bec711a61a5ff93f59ce276a3074129ac76d7c86