Malicious PDF — malware analysis report

Static analysis result for SHA-256 c056befbcd6f053f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 10:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c840d1ad3df6d16679e9f223a3ff3ae SHA-1: 7271e3f71f570e8c71e8dc1ecb58a68f2c7753f6 SHA-256: c056befbcd6f053f0b88a423c37bc226d05aa6b70552bc902cdf94a04cdd9d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hantechwelding.com/userfiles/file/2021091105501573499.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2f4777448---32387599152.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/55386112191.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/2789374308.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/39512362772.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/sisoxadaza.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/33576134194.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/29216377733.pdfIn PDF document text
    • http://zuche0551.com/upload/file/1641522133.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/29550033926.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/kanewedekedafavuxemu.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/24240230305.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/84791997028.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135972054db8---xurobexosuf.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/balojurudedukalozovunuko.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/64958131030.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/puzibul.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/titaxuzezivexexuzulufulu.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89548768169.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/xexaroboni.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/masijudu.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/ranisifotovot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=robo+defense+freePDF 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_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 19460 bytes
SHA-256: 4db4276b24cefd760458673a142a6eb26c54b1cfa8759d3999c3036ac3b1174a
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10132 bytes
SHA-256: 472a931e293c102f4b98818ea19669b89fc74d38c1abf67327280115a0d92509

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