Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e1486608ac369c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 19:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a65411db3e33ff39719e973ea399a8e SHA-1: 8607c71a03d891372cb5fa7681cfcf223b0c915d SHA-256: d6e1486608ac369cfa72c8963616a2795a794f0dba4ce9ce43158854c4f6b44d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a medium-severity rule indicating it's a link farm on disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to various domains suggests a phishing or scam attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vidol.eu/userfiles/file/zewujexedure.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/42268317672.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/warulijadonemalejexafo.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/taxelateramod.pdfIn PDF document text
    • http://3sdent.com/upload/files/5566798845.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052146422985.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/98366433485.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140751c7e9bf---gujuboparanuxan.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/xilaxazutagalotekeda.pdfIn PDF document text
    • https://melz-feu.ru/upload/35164285598.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/fozebazezodaturejimeku.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/wodovev.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65770340711.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/14054837869.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fiwipozaxofaxadaloditimi.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/2528322279.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/96038930096.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/79117164529.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/37826726298.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210907_042242.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/57520229282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=games+on+android+that+support+ps4+controllerPDF 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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 15540 bytes
SHA-256: 13449f1790b6758ff732c1e2a87de6fd6df9838c1f6571017d34d6125cfabcdd
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10996 bytes
SHA-256: 76af68ba3c9e5c215b057a4a9af66de1a0b112ef00f7e25ad3a16ec2dce6c538