Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdb2168b9f5372e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 13:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8daa76d13500451372756183d2765472 SHA-1: 86675be996cf7be707d73412fc59c67e887f9863 SHA-256: 1cdb2168b9f5372e68d150d60ca30ad9e3d53ed573498ec39b7266bcc8605136
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting, characteristic of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=dark+psychology+ebook PDF link annotation
    • https://ldcpc.com/ckfinder/userfiles/files/90691847411.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/33549056357.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/duvuvuxuvaxupofipasu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131048934a5f---1851513854.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/65326582217.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/dojoxuzelutuzetivasovop.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/53863973796.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/sasagufaloju.pdfIn PDF document text
    • https://cardolf.ro/files/nojuvejid.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/semolora.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_152250.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfd9ba7c---20633629169.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/babuf.pdfIn PDF document text
    • http://cascad-trans.ru/files/legiseb.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/xexabawiparufil.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/32314650609.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/68561330391.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/54153244925.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gomupo.pdfIn PDF document text
    • http://gro-felix.si/uploads/visokizonagasafunazeloz.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/72326714648.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/gegilezurex.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/82373764009.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/29491333255.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/kelejedopeserememabewuj.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gonidazivadawobenux.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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10708 bytes
SHA-256: 4c96480bc4e8c0752ef901985f82be5a22451bb5b404c8cdc14f6b628a042ae9
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 17640 bytes
SHA-256: 950cc8879e2f3d605336a8344d89a27dcd23c7157eed08c5bb163afd18a16aff
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1