Malicious PDF — malware analysis report

Static analysis result for SHA-256 60347683b017b521…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 20:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04695ac84e504185cd988ed9b9707ce5 SHA-1: 2def304511358339a63c45730895dd77df302869 SHA-256: 60347683b017b52107c6d266f48d48d21d1e0de6a258b9a77a393f11eeec73d3
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm. The ML classifier also flagged the PDF as malicious. The presence of many distinct hosts and UTM parameters suggests an attempt to manipulate search engine results or distribute malicious content through a large number of indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://cnc-ar.ro/files/file/pitokekosev.pdf In PDF document text
    • http://duszek-lasu.pl/userfiles/file/midagevamijewufijomuv.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/zodatezarus.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/00465c8d23b700f7eacf24e513b73d0e/12783564499.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/jafunebexikoletomegu.pdfIn PDF document text
    • http://photo-poligrafic.ru/ckfinder/userfiles/files/mameparizufe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6b9213106---xosul.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/tofuxasozixarabowe.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/losowozejekop.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/36878606567.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/7669316121.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/86633173410.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/pusetaj.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/27035010197.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/logidijeruxozitaxumawufik.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/3015993574.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109032128275585774iyc1f.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/4160630079.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/56972484302.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/walemukimiravonifuzixitim.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/felagedukegolanorazebew.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/86368534123.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/sogakuna.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/sedixexusemo.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/faxinatijaxuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hill+climb+racing+download+play+storePDF 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_off0000b3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D9 16792 bytes
SHA-256: 3daff820db8daaa0b5d6f40320c60a794dcd68e691d2cb0f9cb75975dabfdf10
font_01_sfnt_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 11188 bytes
SHA-256: df2eabe6501820d21fcc681d588c8aa37dc1ec164995428c4da279b5d6e5eedb
font_02_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1