Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbc91d43a071e4c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 10:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e471f6141165ecaebd200dbd4f547167 SHA-1: 65161306028f0ecf7619ace75c1ba63032eb9f01 SHA-256: 9dbc91d43a071e4c9bfb50c0d6c0557be03b8c3a99c874fd6c22f6b8a47513ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or redirecting users to malicious sites. The presence of external URIs and the overall structure suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.globalnautique.nl/upload/files/zubifido.pdf In PDF document text
    • http://aaz.sk/editor_uploads/files/71727139350.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/60011120803.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/gafapo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/232f4e0ce74ddcb985836208fd6366dc/zajisipebuzodego.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/25700137833.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/158045540.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/tolijowelukovozedaxop.pdfIn PDF document text
    • http://szcftz.com/upload/8934718374.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/sisexuletudezedaduzu.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/mibizuki.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fufifoxenoku.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/lonujuladatoj.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_D334EA01681A07BF.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/fibijanavoverusarume.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/nopukinezagujimix.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/86629943178.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/91613399118.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/mokogijinijibusali.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/rejasikeveduzozan.pdfIn PDF document text
    • http://kgmda.com/upload/files/95467664338.pdfIn PDF document text
    • https://felicityokolo.com/file/71295077479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+copy+contacts+from+iphone+to+android+phonePDF 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_off0000aef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 11028 bytes
SHA-256: dabc1de200aff433bc03436d33670bf1ad49bc481a8bcc101bbac83476c901b6
font_01_sfnt_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 15592 bytes
SHA-256: 2cda4472dbdb5c3c1116139ef24d7119e4d2caf548430188ce8cc71b826d0911