Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dff3c76eca7afc4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 03:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9666f3f24f8a3569fec642c7ec6a100 SHA-1: 0feceb7c5576f80a8d287593e00d42344333b97c SHA-256: 3dff3c76eca7afc433e6a87fe78f28123568ee7d2a646b45a60fb5e2ab9418c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=24+news+live+today+malayalam+online+free PDF link annotation
    • http://autothudo.vn/upload/fck/file/batopejinubeg.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82384157386.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/98312500813.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/72553755378.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/rolenarom.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/9140538455.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/38884936142.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/belusedu.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wowesajararajof.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/63463305216.pdfIn PDF document text
    • http://autodilygood.cz/files/file/37732134092.pdfIn PDF document text
    • http://keyday.ru/files/files/berikokibexunijasirofok.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/xakebirimisufik.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/79791208883.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bizebunesovesu.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/lutekobovedekavimivodapog.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/57988510433.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907002808.pdfIn PDF document text
    • https://greenways.at/userfiles/file/wiletenabaj.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/5038082913.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/wotipabelekorekixomonu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6924e92---27211258562.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/80895007493.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/51720200559.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tamopirozela.pdfIn PDF document text
    • https://ekransamara.ru/files/dekivugazifavov.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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 10880 bytes
SHA-256: 8cab3e3772ae243ff528bdfa52d127af41022e8aaff5cefc43199e0c03a3e1d0
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 17272 bytes
SHA-256: 2cea41c05baccdd067d349ce1eed814cc7b67beef3f2281c74546c778b873c99
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1