Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1d22363329a139…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 18:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36bdd526276a719171ed2b946de186f5 SHA-1: 7f7acebf7032a0ebad1adab141e36732c34e5f5e SHA-256: bc1d22363329a1395304c5fcc79c8de24340fb53a25ac1e30449162c7d4f02af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document is designed to host many links, likely to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://loonbedrijfschimmel.nl/userfiles/files/mozukaralupufupu.pdf In PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/kurukolemexeviviwutu.pdfIn PDF document text
    • http://odumakus.com/uploads/files/kesilobivosukomom.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/83241716846.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/78370827188.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/fujug.pdfIn PDF document text
    • http://gdgom.com/upload/file/210918025341139660hn6566lxg5wt.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306d42a952c---29511620152.pdfIn PDF document text
    • https://tcremich.lu/files/files/38147615103.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/35232863788.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/dakapaminifa.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/29132784041.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/3020372036.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/goxagurizujutanulexakofoz.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3nst192mpn8n6fgrl64gc32dr4/rawukapazejewozenat.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/65518806039.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/76951002198.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/dinedared.pdfIn PDF document text
    • http://halaljones.com/uploads/files/15518035347.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/49361820293.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tapamexi.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/jozebinosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sanam+re+full+movie+online+hdPDF 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_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10596 bytes
SHA-256: ffc332906f162ef5023c399ca89a3dc14bf9bb4fe929dbeb190721aac533576a
font_02_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 17272 bytes
SHA-256: dad9bb78413578a965b9dc0c59a5f9cbb4336f441092b1e83abe9af71d9cb706