Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2448854b1716df2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 18:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd59a8e8bea7c77fca68d49ed90e371b SHA-1: f415211e61125e80458c398b1929164afa9b37dc SHA-256: a2448854b1716df225b8264acadc5c71eef5ad5438ffc9f4323bf23ce38c2ca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://elskup.pl/images/assets/file/14687321694.pdf In PDF document text
    • http://chinazzjx.com/d/files/4821641887.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/86810445077.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gagisixuwenojitulate.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lakotenexerajuvozokomiw.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/vufoxegubinasepu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/doverixapavufu.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/90131245397.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5tl75p0pbknrsj01e3ibp0v763/36957127054.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/87332843130.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gixemoj.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909102035.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/sanedazowama.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tagapujux.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/70040951032.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/zifisememumup.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/sipitalena.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/buwotugajisawetenudavom.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/95476959673.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/17472175636.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xilekazogibutuwisuzexezep.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/95067734912.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/17892414537.pdfIn PDF document text
    • https://majubesar.info/contents/files/zexuk.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8fe1ad9---xativotifuzel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=live+cricket+match+watch+online+on+mobilePDF 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_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 10668 bytes
SHA-256: 1e0971729e6e3f0bb3b9b34fa7b03d3ebd7cbe219ad7c8fd2c38b75b9ab1e577
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 18824 bytes
SHA-256: 0719cdb7aab025859013a5339ebfd32974d00a9af4eeb2f259cb4d603b6de130
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1