Malicious PDF — malware analysis report

Static analysis result for SHA-256 800e3ed889a7d228…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 10:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71262f23021007e300b19b32963a736b SHA-1: 0ae91e96358aadec7bb87370bd727e620dba7d7b SHA-256: 800e3ed889a7d22805c6592334645082c9d1bc30b3050922f1c0dc2668446567
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs pointing to a link farm, with one specific PDF identified as a potential disposable hosting link farm. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thefertilizerproductionline.com/d/files/sowupoviwuzefubet.pdf In PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/sojurulapiribisarilubadur.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/lasejazato.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/47099179821.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905013210240008.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3acc3797125ef744e2adb9b09ea5ef9a/49752890609.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349203543fe---tafolovaxoxifiriloro.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/kuvadijojuge.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kavexasiwewibifivumex.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pewonupitixufexur.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/29269052742.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/18688568743.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/31354247626.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/rosiru.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23743695733.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/21656616604.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/ruvupirelugozosewovepasej.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/18217669359.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/3213909745.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/tajosuzakukavozu.pdfIn PDF document text
    • http://heizler.hu/files/file/32961091225.pdfIn PDF document text
    • http://c-amc.com/upload/files/16351236539.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jeredusebos.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=flyers+poster+maker+graphic+design+banner+maker+mod+apkPDF 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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 17496 bytes
SHA-256: 822e39e9749a8c27d1b0bcd8dad0fe92981d05cecae22402b4a21b4948fe8a57
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 11284 bytes
SHA-256: 5a57439662cb9b4aae693799619e7dd39769ae9286841a8ce437f102070a8bcc