Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be1fbfcded2b802…

MALICIOUS

PDF

75.7 KB Created: 2021-10-06 07:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0144f7b04096b7a208cf6aab69c9f9ff SHA-1: a71d20b345f88d92e80ec95111ca725b4f0ed373 SHA-256: 5be1fbfcded2b802f12102d447435232250ba906ce74ffad00151b6cc67e6d32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=logistic+growth+equation PDF link annotation
    • https://iphastkala.com/userfiles/file/4507824219.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/2641485780.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kujafiwibagiw.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/91244829131.pdfIn PDF document text
    • http://jonme.net/ckupload/files/81114554314.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kesazaga.pdfIn PDF document text
    • http://brukbet.com/user_images/file/lurugobabilebozakugerurew.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/logevowexaxofaxuma.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/bamaxazeguzudi.pdfIn PDF document text
    • https://22importexport.com/eimages/file/14670650286.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/xolixutetozirogerakale.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/bokora.pdfIn PDF document text
    • http://netflor.pl/upload/File/6613570045.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/mikefojobe.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/kutewa.pdfIn PDF document text
    • http://zenhowell.com/upload/file/43142782158.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e479138e0---taritukukijoresunorixu.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/jovegebezevotazobe.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/58398624710.pdfIn PDF document text
    • https://togeltop.net/contents/files/97924270341.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/xapukozude.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/jobikorepufikiv.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/42090472016.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/35187895702.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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 10752 bytes
SHA-256: 2696fec894abec763ceca66bb5bebaca4c581de9e54a369fa5bd3934789647db
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 18152 bytes
SHA-256: d317d1342c7e78dda40d14dffd44ce59418234a612c8512075dd4084150c5067
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1