Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed9cac32a7e1d9e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 20:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d58cf335730ebc569b1745c50fec687c SHA-1: a29139e009a2b1e5067595e17e3ffc4bb5306f9f SHA-256: aed9cac32a7e1d9e5c7ffdf06d03cfc770068133dc955c056eb7df0ac41121d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/jotusumuze.pdfIn PDF document text
    • http://www.grifin.sk/files/fexufetivipokezolowi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/32398112359.pdfIn PDF document text
    • http://blueyee.com/upload/file/040431171300.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/18469515283.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/07aaee51f6a0dd465486bd5d1363b4b9/12609326133.pdfIn PDF document text
    • http://perksys.com/userfiles/file/77006813806.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/77632332133.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/lerefemukenubudogofa.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/40377701191.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///28346038748.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/gefor.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/ranunigor.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/puselipiwawopazebi.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/65895365312.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/bizanoronitakele.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/22908213035.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210913_A9FE602E98B0FA08.pdfIn PDF document text
    • http://agavietnam.com/img/files/38474490816.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/poleximixalebivixuwa.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/nijanetun.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/pefifobinorezudevutufuf.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/l8o22m9g7l4vpkvpnie41vqm4r/murofexopugukaniwiju.pdfIn PDF document text
    • http://ternovykh.ru/content/file/gipuvepotodezulomasefiwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=back+to+the+future+2+full+movie+123moviesPDF link annotation
    • 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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 17556 bytes
SHA-256: 1e158de4ef66c1f8c785da6031cbc2ab8f3e73207679eeee2b95a5c5374c26d0
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 11152 bytes
SHA-256: b939d81132289f25c5500bb94120c54bda3af55331dc8c7c7163d0fa1b2a813d

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