Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4856a14b6947918…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 10:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9aeeb3a38fca5037d2179ea03d080065 SHA-1: 2314d7bccc949047f5fa6a5f21caf5200af160f0 SHA-256: e4856a14b6947918081bd067330f229913528924e390bd9ce3b688d77021fbb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=the+monkey%27s+paw+comprehension+questions+pdf PDF link annotation
    • http://olymp-kiev.com/temp/fckeditor/file/32221944188.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/vigowigotoluxepivekozafi.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/netokofuwe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a9b31bf1---xidazuramavovomuf.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/18306935108.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/97829762719.pdfIn PDF document text
    • https://birotex.rs/images/files/54838810475.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/54777795667.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nepaxefijufebuvi.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cd943719---sufideze.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/kisuregutuxiborefeguzima.pdfIn PDF document text
    • http://kunbot.com/upload/files/lasotabax.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xonegukirixari.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/75997075669.pdfIn PDF document text
    • http://www.pvvc.cz/files/xokizaw.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/72197833693.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/61278951776.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sukolabimuxusodenef.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/bogumenuzim.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/59628783315.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/nesulidogogobovutakuzeso.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/puropu.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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 11372 bytes
SHA-256: 622e6cf6cff5a44d816db173b4deb7e97ff344d36d0764365c4ddd35af32fb5b
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 17308 bytes
SHA-256: aa68e0b5e246ba5b333e56bcecbe2c1669cd0d56f7fcabe1d53a95b9dcd9c9e1

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