Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a3741dadb5e730…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b19e0417ef4146595b9c7f61f06ce8fc SHA-1: 35686af0385ec68cda4cbc5a552959b4a995e52b SHA-256: f1a3741dadb5e730951cc6be87b74df33ccd618bd5a6068e1444f160fe949868
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to host malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to decrypt an archive, likely containing a payload. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.amedna.com/userfiles/files/diwefimadozojifi.pdf In PDF document text
    • https://preciseenergygroup.com/media/dekajenosebawuferibape.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/46974179242.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/taluxukovigurenezipuruji.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/79623399163.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/38723509874.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/fubodeluluwolodixasesiv.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/93355496697.pdfIn PDF document text
    • http://travellerisland.com/files/nazij.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vurifuwufokifuro.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vinobipavupabiku.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/sofowuguvisetarixate.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/kumupepusabikenabisuned.pdfIn PDF document text
    • https://kimcert.com/E/file/1310916521.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/14062190876.pdfIn PDF document text
    • https://nada70.org/userfiles/file/musupepazazoselomewumim.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210916091733.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/volozixijawume.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142ecdfcb22e---vegoxewinijomajakemuli.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/36576877453.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/wopuxo.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/jozogojedito.pdfIn PDF document text
    • http://hla.vn/upload/files/govulu.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/xolisutubezini.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/zajipalupuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=win7+simulator+apkPDF 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_off0000b7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C3 15880 bytes
SHA-256: cbd838382a9da04939423ac2376b127c6ca8bd66101928b2d3b8e954a3d2eb34
font_01_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 10516 bytes
SHA-256: 0a23787d26076d0ef378f137680b80696c9813aaef352bc1a53c18e6355eb1aa
font_02_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1