Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41e6c2892a93b11…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 05:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a8469d0587b3bf30df84f8c74dbce89 SHA-1: 84e5bcdca8540c82d301d4ab9fafdba2fb8d4323 SHA-256: d41e6c2892a93b119df28ef61cb804858984ed112b547bbd57277dcc5ae2eab4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous disposable hosting sites. While no scripts were extracted, the embedded URLs and the nature of the heuristics strongly suggest this PDF is used to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cmi.nfe.go.th/ckfinder/userfiles/files/wexobiwumexiximul.pdf In PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/kovibivixuzux.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161442bf8020db---fipebimiw.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/gepotumejatevav.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/vabevajodopafovaronat.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/jubawowelowefufizoda.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/notevotukewosumup.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/45598912017.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210923085409.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/puwebojusetojufebufati.pdfIn PDF document text
    • https://banghenails.com/upload/file/fojusofaw.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/77466298104.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i95t5l0sdvvtt1bfgn6157foij/mokijexatatafovota.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/29097243715.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/xotugawatojagomibepe.pdfIn PDF document text
    • https://servauto.fr/img/user/file/pululofet.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bovefegukexilalalojete.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/53886610942.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210905_264E9382928729C6.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210926_17460F080308DF94.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/44521377671.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/29439057861.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/82169041591.pdfIn PDF document text
    • https://datawire.gr/files/files/lizoruwixi.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109270459176841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rich+dad+poor+dad+pdf+marathiPDF 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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 10480 bytes
SHA-256: a1eca19ec6be97f40400a268ca8394029948fde28f068e95df5be8704227eca0
font_02_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 15020 bytes
SHA-256: b8a78dc10f2f9de362954bef6c9b172a33832c6a9a7ea2680003cee3e5ba388d