Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc681a79969fc926…

MALICIOUS

PDF

69.9 KB Created: 2021-09-23 00:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b35bc05d3d2e762815020cd98351e9ac SHA-1: 86c10b8ef2186f5f237e9dcee54d2250ddf8b24d SHA-256: dc681a79969fc92699529127fd35c4adad1a93d7b2b4dec5b3d062f59f0fc864
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://moiarchitekci.pl/pliki/file/wolulaletonilevorid.pdf In PDF document text
    • https://megalightgroup.lv/uploads/files/parivebelazela.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vovojonunosawobizisukig.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabonutevefenimegenudijo.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/bulujimawam.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/pajubis.pdfIn PDF document text
    • https://matratva.in/userfiles/file/wudovuxosazojid.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/komep.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/5257387240.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/gajonenivevabolu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/fedosapaji.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/laxenokali.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/55428456293.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/winonuvix.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/semofatoma.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/56591803723.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/sirupurepolapuxiwu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sepazejexejibazakune.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/tawixap.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/buzapibodipukutotawodapu.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100321595244.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2erne8qjovd9jd9g53pdl1e08p/nizavefutibigemaj.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/99469407570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cookie+clicker+hack+iphonePDF 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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 10328 bytes
SHA-256: 6f427b329dc2a7a6d1ad547714c34dc70a1488cdf6857f6743c7425763f25509
font_01_sfnt_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 14712 bytes
SHA-256: 097c97dfa6547a44ed1d2d53702bd69257ab4e318bbe953b20efc57159a8dae1
font_02_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1