Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17425259b4829e4…

MALICIOUS

PDF

101.9 KB Created: 2021-09-13 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97bf28520bd77ac9877d5d9b215efa83 SHA-1: d7a974bcbf8c9cd1889dd69adc8524bda6da3a5f SHA-256: c17425259b4829e4c8d443d800f592544e919bbf00697e7b51eb2500eb274c34
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 pointing to external sites, some of which are identified as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=agatha+christie+books+in+order+pdf PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc152dcc1---saxobugegulogu.pdfIn PDF document text
    • http://juha.be/_files/file/94831865421.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/jononoveritugemefad.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/71660145046.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904195740064616i6h7gd2j8xl0.pdfIn PDF document text
    • http://dd-eng.com/files/files/sidanidavanusapa.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/99361601999.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/32026886130.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xejodusatisinawebox.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/zorewafosebaw.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/dadolirerelevazosawu.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xaxuwaxazipezekevezabekev.pdfIn PDF document text
    • http://goldia.cz/data/file/tojubesavelo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/34252739129.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/manevonawoziruxiwul.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/48175601589.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/11612940646.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/81319394326.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/50173076013.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/82224019986.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/73428371943.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/23824272992.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/mamifepozekemavegizivodoj.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_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E53 19156 bytes
SHA-256: f33a2176ec4d5645ab177aadf34170af482f21a138b3ee5261caac6099c77c90
font_02_sfnt_off00017034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17034 11064 bytes
SHA-256: c13880ed2a311b3a83b6abc9ea774f5da2613af404eb89bae65eb073e8f43fe4

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