Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ac9f1c334cc4b8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 02:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a2adfee1be711ecbb030bdcf17b1fce3 SHA-1: 0f2b55bddc612d907983c94042aa9bc1412cea12 SHA-256: a0ac9f1c334cc4b8a042ebe3cbc45073d2a74cf52a43baaed8f4f01914256060
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate a high likelihood of malicious intent, with ML classifiers and ClamAV flagging it as a phishing or trojan threat. The primary attack pattern involves luring users to click on these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.otevrenysklep.cz/ckfinder/userfiles/files/delexakomizunu.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ec9128be---levatinivexenudapu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614df59484b0d---14250278578.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jopapowovi.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/5578596764.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/48804729636.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/79253099853.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/zolajiluludow.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/vajoxira.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/86693647312.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/25296141184.pdfIn PDF document text
    • http://scro.ru/pic/file/degonidunavepilewovoti.pdfIn PDF document text
    • http://baove24h.org/upload/files/juvivixegu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/28747324047.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/tabeparojibip.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/fepolikapokasazizenuwiro.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mudogukewajaxewuza.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/36499779743.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/95048242876.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/960697019.pdfIn PDF document text
    • http://zamaro.info/images/fcke_files/file/18145376142.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/lisorolederidelimexemuduk.pdfIn PDF document text
    • http://kalikraft.com/images/file/24289419066.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/93430267061.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/jazebomafekukevudoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+notch+3+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/81906778470.pdfIn PDF document text
    • 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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 10152 bytes
SHA-256: 53cd7774174d70bb796d3bf1924c1371b3adb22009ef97c11d1ca36595a55f2a
font_01_sfnt_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 15444 bytes
SHA-256: 5aedf20a2fcb225a3c9123f3a2635db2ccdeb2f0a86d46e9a4c9cc610eac0c59