Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a55f1154395bc5f…

MALICIOUS

PDF

73.7 KB Created: 2021-10-11 08:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d2071739a2be03cf2d4f8a5773b2865 SHA-1: 4bcdfaf23b36038ff83e560d59466c417f2760ec SHA-256: 3a55f1154395bc5f69f0c1b7e752b7ccea2c840f1b7dd79251d75495e41a51c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, suggesting a lure to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=download+game+bus+pc PDF link annotation
    • http://ieltsadd.ir/cache/fck_files/file/42605017243.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/bibunupigazizuwukunu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/38200088124.pdfIn PDF document text
    • http://benrassam.com/uploads/files/9001422483.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/wifalovozunoxezudopojal.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/71281652786.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejudozijonelaz.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/lizoporepitagop.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/petomizuzu.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/wusosut.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/47246691051.pdfIn PDF document text
    • https://kokomanis.com/contents/files/78770638306.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xuzafofiwipifowi.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/81986406742.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/penopikajataxaxurasinonur.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/12819946034.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/72381493840.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwipozubuwabal.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/75323422926.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0ssb3vsju94sp831qu7c7qfpi/65064239618.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161609c8289b58---69816605217.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/66731844463.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/jatovu.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_off0000bae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 17868 bytes
SHA-256: d1a1abe26df744feecb1f970d216cfdb620e151918aeaa347c972d1c4032b34c
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10892 bytes
SHA-256: ae635b25f7c8cf36e7a170df68eedbb809c97c60c2dadbaf141175c90f58028b

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