Malicious PDF — malware analysis report

Static analysis result for SHA-256 d931c7688ef0f851…

MALICIOUS

PDF

73.9 KB Created: 2021-09-26 14:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6abddf25d4c788fd9533fa026eed7b72 SHA-1: 62593f015683698a4ebca7b93d025d628bd03519 SHA-256: d931c7688ef0f851e8553ab7bcc2c6ba857d4f57b369edae830450fe8f235b02
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 for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=aplicativo+para+gravar+voz+android PDF link annotation
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/50857003037.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/feniforulofibaza.pdfIn PDF document text
    • https://timminsrenovations.ca/file/CS5tAobT1wkQbh53.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/39232182277.pdfIn PDF document text
    • http://saimiri.name/upload/file/99376243658.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/pufinadi.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/15262063695.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/19984138644.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081837e91a---56326674450.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wotonataburuganeruxev.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/48102362115.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/dogimusipojigilaseto.pdfIn PDF document text
    • http://someteme.com/archivos/_20210924085728.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/94210156963.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/dogukus.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/18698935748.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/fodokawadozugilibunetojo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7b6093f1---96997796383.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/pujijutifezosarobare.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kedisimasalefale.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kisoberidof.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/48926700006.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/zesovuvazitebovesofup.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/85747520283.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/wevidinitatinerod.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/78664294074.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_off0000b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 10496 bytes
SHA-256: 5b897c9c8828450a0a4b144f35f7ac80a4c61a046187bd863c5c0afcfee3823d
font_02_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 18908 bytes
SHA-256: a0807eb14e4f59105dea26c8985fd97b38f8b7abf4613f3f45fa5bad5135f315

Open this report in the interactive analyzer, or submit your own file for analysis.