Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fd04888283a39c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 14:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f944b71be3d586058ec9a96115bb8e4 SHA-1: 73eed63a2d0baf55ca8a811d84b54873911bdf08 SHA-256: 80fd04888283a39cb6253d76cb8c0dba477e319f89b1d2e50e05c7e9c97719b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of numerous embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://85560891.com/upfolder/e/files/20210910060704.pdf In PDF document text
    • http://distant-property.ru/fck_editor_files/files/linudinaves.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/78360017477.pdfIn PDF document text
    • https://betsin.org/userfiles/files/22861048287.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kcc73llqg29cmnir4t743oafs0/96237717727.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/97637150128.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/33841359422.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/87648323204.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/rasadoxeredusufosari.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/mifujigesofuzolelajujifil.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/pipalelef.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/nidaxixibapeku.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lafewukovasid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146994449813---sokalezowewalopizisotuw.pdfIn PDF document text
    • https://shibbirs.com/media/files/rujemujudolufove.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/rixofaguvof.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/71149164119.pdfIn PDF document text
    • http://yuli-china.ru/d/files/mokewaridegizofu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/21670349595.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/zireji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+broken+screen+enable+usb+debuggingPDF 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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 10760 bytes
SHA-256: 6b6e83e1dffd4f97dd5b35399e5c41f7271fd36d66ea1d00037a46a41b553781
font_01_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17860 bytes
SHA-256: 56ce81a08f4a701d31c21582e932209cdf2ee567f4f6063088ddb194d29f53de
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1