Malicious PDF — malware analysis report

Static analysis result for SHA-256 3801a3961fce131e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 23:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 513328130772e440307ee2aa0a5b77fc SHA-1: 533782ff80f775dad0d05e63ef9a410e558ec846 SHA-256: 3801a3961fce131ec347c004d70a6e012c91a78e3573ecf4850ee26903abe10e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, suggesting a phishing or link-farming attack. The presence of an embedded JavaScript stream further supports the potential for malicious activity, likely to redirect users to one of the many listed external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=clear+cache+from+my+phone PDF link annotation
    • http://tuttotop.com/userfiles/files/71191489931.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/fifazat.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/lasibipaj.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/datowa.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/24931895426.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/70476732762.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613492617a513---33050055226.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xunotusiwetukexogegoxu.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/98981467324.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/85427232471.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/teguzepolelediroze.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zagik.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/56987946307.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/tolixekugatureru.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/65086415187.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/varevujipepudidaz.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fojejasukuxivawanulesigir.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/titusi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613497e6bbb93---46669363952.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/genarufapewirafaretujudi.pdfIn PDF document text
    • http://vln.nl/files/file/26267575991.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/99903256252.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/56969995048.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vududawadukaxevatisuvase.pdfIn PDF document text
    • http://prmakeup.com/Image/files/17097701471.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/tabareronosigopavop.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 18656 bytes
SHA-256: 99373227b58a3de86babb4e3fd8baf68f79827e8ba2d8278948c23fbdea7369a
font_02_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 10532 bytes
SHA-256: c244e73458d6c7cddd115c8ce37a3f6ecb0d58efca5fa46dc2666a35257524fa