Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea7b6bad2defa9b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-14 05:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d34dc444e32944c15979f56f0ea53a3 SHA-1: 1aaec93128721304778b2c0f9235512fa87ce7e5 SHA-256: dea7b6bad2defa9b1f0c47933e82a4efa4d7ff645183a5839fa55cea2ffeccb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to other PDF files, indicating a link farm or distribution mechanism. The presence of external URIs and the 'disposable link farm' heuristic further support its malicious intent, likely to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://jinsonmetal.com/Upload/file/tagemegeli.pdf In PDF document text
    • http://kleinschadenexpert.com/userfiles/file/zotevofapepelosisimi.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/16650940962.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bufagidawefujod.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/gamixamuzonekaroxazavuwut.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4695673952.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kosogagi.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/78689655856.pdfIn PDF document text
    • http://minipit.com/data/files/5748560351.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/lonokar.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/detike.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/weditaxuvavekigike.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/gosujupagelokugazoxemoped.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bisowizosimigudifemi.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/fuvapadodevewi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210901_F4A9ECF1C599C181.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tebubijupajeriduxo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mc9mpfma8gi5446flsqmjcib3l/4274670901.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210902_313351229CCEFE3E.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/46167771999.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/jijugafidaladizoj.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109060815541628.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336fde8d9f---79765258263.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/41955925711.pdfIn PDF document text
    • https://somogyplusz.hu/files/lepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+app+players+for+pcPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/buziwirilulapokoro.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 10612 bytes
SHA-256: d53010e0b0cea9a71e353ae4b6313d333e49771d9a18e6b7a28753ac4203998d
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 17332 bytes
SHA-256: 83978198165fafa0307157b48d231e762d5d519c1c0ce88f345ae01dc89eac0b