Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a719e3abc50f65d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 10:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67417477ffd4a02f66125ed7fa660ac3 SHA-1: ee0bdccec633c2d066bb7dde85c0cca064896bf2 SHA-256: 6a719e3abc50f65dbbc6b4b99c3e70e21fc191226be847790d2962f70e709a5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=sembulingam+physiology+8th+edition+pdf+free+download PDF link annotation
    • http://micronforgacsolo.hu/UserFiles/file/wudawenabipofarelu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/90338430840.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/14204265692.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/95096361222.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/jakarejovuzafemi.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/jezadogawebegowemaxa.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/mugabi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-9/20210909223017387820.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/35474343870.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/foruweragomakubof.pdfIn PDF document text
    • http://halanmilk.com/upload/files/6715333557.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/95124815406.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/mawavoranaf.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/dejexa.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/82670163554.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/marusuninabesitega.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/gasovexosevalonivareno.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321a5e97074---sakisewovatoxe.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/fuxuxot.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/kojejo.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/farumifiwik.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_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 17820 bytes
SHA-256: 38fd088bdbbd5b5f06ae3b1a1e7782d42dc8d1cd842bb3ed4dc758a0e0459e87
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 11668 bytes
SHA-256: b66e4613446f63de156917d3a81f37c5b77471243eb6f0f67099df960cc222bb
font_02_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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