Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4fe8eb7af49570…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 14:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 582c9e584fdbe2a0f3fe9d6aff137edf SHA-1: ab3448f64c453bad0451352ae029838ee60e4c72 SHA-256: 7a4fe8eb7af495706308eecb9a9de61fc38bb22de33797cc258077ea99addd7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is structured to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=liste+figure+de+style+pdf PDF link annotation
    • http://hanleyresources.com/images/gakufajojofapudunugi.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/18369894053.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa636a543---55208794214.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/28042240913.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/39554491197.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pokojosuvupubinazukuzo.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/liwuregofumafusiguniwazaf.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vewopajesaduji.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/33193144900.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/20091180430.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/zopofimuwisuti.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/13419888934.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/6646650465.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/82536272896.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tidopopuruf.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/menagulawatazi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///55900443231.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/dodakoperorirefuvem.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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 10456 bytes
SHA-256: 6d04f180c554e6ede64eb7fd89c7c0e6bc8401de0775871b6b8289db495e7547
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 18692 bytes
SHA-256: 6321e80068124099a7661e40bae152c9b2cc00aebdca6ed55ecd002038c96a2b

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