Malicious PDF — malware analysis report

Static analysis result for SHA-256 7501420ea3adfa50…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 09:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82f86cadb41311b7c0581cbf75a5b93c SHA-1: e110cbea63576381190250e833b6ffa9a1467c11 SHA-256: 7501420ea3adfa50d5758a08cca2be3e5fa92019d2695c9d5f9e2d66b36afb5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting a phishing or link-farming operation. The presence of external URIs and a high number of distinct hosts for links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atrax.hr/files/81757643243.pdf In PDF document text
    • http://centralgiving.com/media/userfiles/file/nejobovopatabiputamixus.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/69466065424.pdfIn PDF document text
    • http://awards.nl/img/cms/file/31988167540.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/gevevamokemeruwetu.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/rizejejazez.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/77155629615.pdfIn PDF document text
    • https://istanajp2.com/contents/files/62278042693.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/51062678567.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/jekipibafinafapuwareliv.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/5596219242.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/24934788054.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/41961592181.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/julodupewuregif.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zomemupekowaxokato.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/jifedazapepupe.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/30500982504.pdfIn PDF document text
    • https://isleo.com/i_photos/file/62200661447.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/45227663726.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/9002809158.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613536efa044e---34519843558.pdfIn PDF document text
    • https://oasis-travel.ro/files/sufilujodagel.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/jikelojulaxibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kumkum+bhagya+29+june+2021PDF 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_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 17296 bytes
SHA-256: ad0760ac8379f507f894c1de997bafea627e7529ff8393ae0a2d8f9ba1fc2182
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 10960 bytes
SHA-256: 8a9dd8c5f582b9eda3193b07676e515388eb0d0af59c294d72ed6046470f01b5

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