Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f6d5c08bf1467d…

MALICIOUS

PDF

65.6 KB Created: 2021-09-25 22:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea57e8ab5842abf409ae369983a6278d SHA-1: a06254c4be969e8ea27138955ea916c12960a266 SHA-256: e2f6d5c08bf1467d8a4ef9c2f32585e508af782e75f060719709d56b8a46cd68
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious domains. The PDF document's structure and the presence of external URIs suggest an attempt to redirect users to phishing or malware download sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4894

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://philabc.ru/uplcv?utm_term=dawn+break+mod+apk+unlimited+money PDF link annotation
    • http://mtsp.by/userfiles/files/50568912518.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/36659592915.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/97610634968.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/tepotuvikawamalatiduduwuf.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/66624492193.pdfIn PDF document text
    • http://ruihuitax.com/files/file/26378229825.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/42647288654.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/lawolinatodefagev.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/vizevaxufenavewolow.pdfIn PDF document text
    • http://chromavials.com/d/files/bonej.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/gakosek.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/67813268941.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d26aced6528041401ce7e6aeb11085c/30314744637.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/xawixaruwuvip.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/8294736544.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/mopupabu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/88140304925.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/22909769314.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/56051945328.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb6d89b1---vezofesuwuxasiwen.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/46081797804.pdfIn PDF document text
    • http://goref.ru/files/file/45335122362.pdfIn 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_off0000add1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD1 10916 bytes
SHA-256: 45b049abd561060f6d87a2643dc8f6dabc44ed9886c5bb45062e0a76d8258d4a
font_01_sfnt_off0000c6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 14844 bytes
SHA-256: c7c4ce431b2ac031e2088aec37da6940e42e62c6b97c5e70d78b9edf1fec974f

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