Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2da9cca276cbb5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 10:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 738410d726513d3abb030d43c4e1c2cc SHA-1: 939ab3050cedf5ec68a6590355d140eaa5f27235 SHA-256: 7a2da9cca276cbb5d810a64ffe65a5939256874c21e266eb34c0943731f10301
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, likely for phishing or malware distribution. The embedded JavaScript stream is the primary mechanism for executing malicious actions, such as redirecting the user to one of the listed external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=uk+used+iphone+xr+128gb+price+in+nigeria PDF link annotation
    • https://caribemed.com/userfiles/file/joxugaturamagezusurur.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/zebuwinu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c6408e82e0040f03209e5dc8d47b3555/41387651912.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/9898968408.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/52687284561.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/zokixuzej.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/97842420087.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xajufafifolitotoluzi.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wuxefutabupanixaxolip.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/goxex.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jutawimerugaja.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/36899657509.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/nojemir.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/xilijedoti.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/sizejusalatubejoxefewiliv.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/sozaziwuvakawamijolema.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c682af27---81177098165.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/rilufalibutosalusirunuluz.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/55157887289.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/raterejevuramobajubuwi.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/179be8602ee054677d2937995fde4be5.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/pativibubuzavosumipatem.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lojetopitorurikebaf.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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 11472 bytes
SHA-256: 1eb5db0196842adcffc692009b62aecc99a970a6dbef68ba97c58e970e359443
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 17656 bytes
SHA-256: 367b12cb3e687a8ca8a5005845de8c51e9c6099122c5d4800b6d2535440c3a3c