Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e92ed2bf1315b51…

MALICIOUS

PDF

97.5 KB Created: 2021-09-16 10:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19b2820c4f5797949b81eea4ebc30b47 SHA-1: bfb134c5a23f42c9b3f1a17761a0c1e60e030000 SHA-256: 4e92ed2bf1315b513bc7ce5ed64a513d70e45c93d71438e2a56a850cecfb21ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=boku+no+hero+academia+2+heroes+rising PDF link annotation
    • http://pescepiana.eu/userfiles/files/xikatabofodimunena.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/gugejedimivelalujogonew.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/jikusupurawedisimofop.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/4680621303.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/40816051943.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/79232130828.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/kifuninidebiwivodolozanul.pdfIn PDF document text
    • https://hoavily.com/uploads/files/sufebirafivira.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/84365381789.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/87362560552.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/33028135443.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/97243949144.pdfIn PDF document text
    • https://linardi.ru/files/file/24974668545.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/20089169318.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/ginipom.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/99002506797.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/38499199314.pdfIn PDF document text
    • https://sapporopools.com/contents/files/57377349583.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/31180338470.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/jafoberesotodirikovulir.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210910055640.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/33830701557.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/bomowalafusezegisumud.pdfIn PDF document text
    • 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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 11040 bytes
SHA-256: 493565593e875b94c9e035fd7b3395d2234255677cfa6bd78c891657c8d8dbba
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 23532 bytes
SHA-256: 7e21f21a6a65fd93221e1818b2b1053662c5243ed8fff801e0aae26f616947f1

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