Malicious PDF — malware analysis report

Static analysis result for SHA-256 583e9766c68abece…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 18:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0f9190505b4c8ebf66ca419982a6778 SHA-1: 0bcb0360aa463baf7a9abf39c57fb3648250052f SHA-256: 583e9766c68abecec8b099ba4c77de471892504b97a19657bc60eed5ca4c2f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=critical+thinking+examples+pdf PDF link annotation
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/gubegolivorodoxu.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109080533078986.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/39373351967.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bidopititotizonudar.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/nisokozofejugavimaziluva.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/96239751033.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/nikiterike.pdfIn PDF document text
    • https://alkoplast.rs/files/bipolabigivuliriva.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/fonamivedi.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/51647615623.pdfIn PDF document text
    • https://aaaxxion.info/images/file/90452580168.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/matarufavo.pdfIn PDF document text
    • http://gibisch.biz/files/files/37108446148.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d522544ab---8162160925.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/92081278532.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/bunagapekowewuwij.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/90783664799.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/18591696553.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/64160640470.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/sodumebonetakedoref.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/gegupi.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_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 11172 bytes
SHA-256: 041cd932a3500a096bc53324e3341b38fa78ccbe00f18522482b92c140d638bf
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 16944 bytes
SHA-256: 06226eff12c860255fb12130ade4f6f5b795b5f5eed3855988df09ecf0eb6eb1
font_02_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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