Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35e72d70fc95d1b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 16:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3f9763f28ab28fb744b07692afe8373 SHA-1: fac7ffe03a7141d93172a2753dadf82000df035e SHA-256: e35e72d70fc95d1bdfe78b6a0c0c30f8ae9db60f43774fe4fa72f82222c1e087
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=ml+account+hack+link PDF link annotation
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/relamezowixizixojinu.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/63450895039.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/dinaxuteso.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/93159130184.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/gipapituganazamuv.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/72070193773.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/34605839936.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/magusenuwo.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/fapuwibadozodevisobevepa.pdfIn PDF document text
    • http://normel.org/files/upload/file/11643070964.pdfIn PDF document text
    • http://3asoft.vn/img/files/77586888677.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/74989146967.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/petisusimamedobi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/17388173238.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/41340317549.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zesexelanonuluwoj.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/17487729002.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/fagofesiturulanokanaxupiz.pdfIn PDF document text
    • https://andreivieru.com/ckfinder/userfiles/files/75293223476.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148dc7984ada---63055143983.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/62593127395.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/50101302442.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_off0000aeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAC 17276 bytes
SHA-256: 01d5893183b828a14d28dfc24b40bab7155a3a47878be23245248db6e64a3593
font_01_sfnt_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10112 bytes
SHA-256: 29d699ea4281c3f05c083d3b9007dffff82ca55c60ccb48638ad6474fbebffc5
font_02_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1