Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec024878dcaddc3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-24 10:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f88a6340924d2632d1183b28dca02a4 SHA-1: e7a013ef5ba0ffbb3e50c0747b27120c6f83069b SHA-256: 6ec024878dcaddc3b628533de06e27d633620f77055e98cbd3bd55c0c8fb1a6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF structure and embedded links are consistent with spearphishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://infrive.ru/uplcv?utm_term=gute+videobearbeitungsprogramme+android PDF link annotation
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/guvofazexelajaweno.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/danewotegef.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/25788520632.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/35790455924.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/29477717737.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/sisawuxexon.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/linuxa.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/27232950731.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6506fs1svnn1hhvhjs0p0p6vj0/jukewixigaduf.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/lifidakumajatidegevasabal.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/nidakagixizinox.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/fejugunodazigotosexo.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/1277736321.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/sipiwi.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/38694629475.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/gutiziduxinuv.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/kulafe.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/kipodetaliwebegodi.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/zaluwuj.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/83848760994.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/34544415540.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jutudef.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fesedomodazusux.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dexuvunomivulunuxa.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/wumogaku.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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 11036 bytes
SHA-256: 5b014c64d846dcec5ebbf6ec944701d1a87bbf0d49a011c5970ac1d794cd06c4
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 19560 bytes
SHA-256: ebc4568718d73171355e7d84f8d9162f593e45d955ea76770e10a1402ce9a77e
font_02_sfnt_off00012b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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