Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdf0b6bef349b89…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 18:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 478ab59fb219b4cf52225d21dd22d97a SHA-1: 75bd52a1b90887b6b1154eb4fd24ae8597b8b760 SHA-256: 7bdf0b6bef349b891587498ff0ceba3fb37015e0d0e4dc58fa0b03ebd3d2f03a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of a disposable link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://tythb.cn/uploadfile/files/8186026852.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/79804101352.pdfIn PDF document text
    • https://hkki.org/userfiles/files/zedesun.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a11f37ac9f---zapemamametekunuxirofiwok.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a47563a76---verodugel.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/21632569808.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/fixatevilokiwobijubupo.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/bosemo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/muwodilamefaraxi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/27379735414.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/pavavowivomodidisekato.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/20598940745.pdfIn PDF document text
    • https://businesslife.com/content/file/6592214480.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/seweruvibipek.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/61092615768.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/93110763032.pdfIn PDF document text
    • https://kaimano.it/file/wagafakawumofi.pdfIn PDF document text
    • http://epmachine.ru/d/files/perotipepikozifivuluxaja.pdfIn PDF document text
    • https://topupdana.com/contents/files/sijipodedefekezomukodata.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/70699978365.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/badetiwaximonotipibajuvub.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/89288050820.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/64710701018.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/53985492683.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/25341799779.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/sowunebu.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/31489948646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gta+v+mobile+online+playPDF 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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 16644 bytes
SHA-256: 427cbb3b454ff30a72e7ed429e2e6891055b5090223413276f774c1b34e2f663
font_01_sfnt_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 10504 bytes
SHA-256: 6ef4b3ddb0b0750676a1ab68cb15fcf5a0ebe0f87a24371622d7e456f16c7361