Malicious PDF — malware analysis report

Static analysis result for SHA-256 333fc0afe67b0bf2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 06:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11e065b714517170826177a5a81ecca3 SHA-1: 139a0854263300c168168cfeaf11e717102b4d3b SHA-256: 333fc0afe67b0bf28b7f62021d3f9636259b7a0456a56115840293238013fb32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medicom.pl/userfiles/file/17661191212.pdf In PDF document text
    • https://pima-alarms.net/slicice/file/50924743913.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/kimesofivogigipixejesibos.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/17256341996.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/16325588662.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/6446593962.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/gidufidu.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sawikixeti.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vanugodasinofab.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/85088773417.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/menivezapavurexepi.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/93314227439.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/tanig.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/2345963544.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/66831106761.pdfIn PDF document text
    • http://rapet.hu/files/7704992075.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e992571d8---80578035052.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/pawezipabotegijuxowedor.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/39482926522.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/84284272118.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/38621847728.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jobulugusi.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/vatovuboni.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/kokoparedevovemasimiteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=full+show+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_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 17488 bytes
SHA-256: d9747c7d3e4817afd2f90f3a5a81927d6a61b1681a01bd4dee57bded21ffa46f
font_02_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 10080 bytes
SHA-256: 45a7c7fa8f046b425f464f56347b1bf742bd79383f80353261a5a94007bb8a90