Malicious PDF — malware analysis report

Static analysis result for SHA-256 f717d5f2d7eb42f2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 03:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 327d642dac301ba70bd860931f4d70e3 SHA-1: 950f7dcc7d8745d56133f2d1cecfbbda5b520df1 SHA-256: f717d5f2d7eb42f2b8df0e993a9ea8712d7bb3f6a2842f5af8df1c225cde9f18
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 that form a link farm, directing users to various disposable domains. The presence of external URIs and the link farm structure strongly suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=where+can+i+download+seasonal+movies PDF link annotation
    • http://www.pratikchoudhury.com/fckimages/file/87221933749.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lorafabevuganarasorulanow.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/femobizawug.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aad21c345---rabakokegolevovuxinureril.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/gavugigisaparesavolep.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/35852992635.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/bisonofizikemani.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/depusuvota.pdfIn PDF document text
    • http://boldogelet.hu/media/81013169928.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/70042106651.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/rujuxoxulifivuvubavo.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/74641393520.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219201448213946.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/60334716458.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/boromikozin.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/jepaxadeguvoworamitim.pdfIn PDF document text
    • http://come2menorca.com/images/file/mujitasigikod.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/71659318648.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/tijavowedojikum.pdfIn PDF document text
    • http://juha.be/_files/file/maguxajifi.pdfIn PDF document text
    • http://elsped.hu/files/file/kinaloxugas.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/21571423279.pdfIn PDF document text
    • http://elskenecologie.nl/files/wibegokenadefajomugig.pdfIn PDF document text
    • http://raczcsalad.hu/files/14463148584.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_off0000b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A1 10680 bytes
SHA-256: 0fa7241278b2842ea784cc61667acacce4445cf028bfe78ba8a0872eac8ed61b
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 17144 bytes
SHA-256: 2f98c7e254caf67204c25d9a99be713408a21418a18a31815f381d052fb8dd60
font_02_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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