Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1e6263f16cb044…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 04:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad9bb8c3c04c5f84dedce1424046806d SHA-1: 6930ae83eb0e11ad58b7cd96e3960c3c0f945097 SHA-256: 7d1e6263f16cb0449a6cc7635cef414582a54f7a28321322294bc2fc4d0e3d17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garnizone.com/userfiles/file/32466215743.pdf In PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/zopofepazi.pdfIn PDF document text
    • http://mcutech.net/files/52047699716.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/newokiwibedenaf.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/94977025234.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/81619949656.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/74879020088.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/vipegubukigoj.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/11233311898.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/vagumapukadaxatipibatuvul.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/51543705406.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/83dc9a06ccae1ad6ecc14967e9c89517/65763565924.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/63737386167.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/ruvipi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zizibelo.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/39424567832.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/42475269221.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/64900791619.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c613d290---kexekolatasuvolijajabe.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/74982854494.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/78173965297.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/89048214080.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/30007907804.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913140201_a2F3ZWR1d2F0dQ==.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apk+bus+simulator+ultimate+modPDF 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_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 10760 bytes
SHA-256: 51407d06a1fdc76acce2ea21aa591cefbbf899301034b4f7e4e52c10a3ceb2ec
font_01_sfnt_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 14348 bytes
SHA-256: 90d0f83b8d1b6d63577cbe40598643b0f38923a1ad842226ffad3265fe2e1ebd