Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5340e939090493…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 05:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b1f6e949e0f4c93773a587cfec64932 SHA-1: e718cd162089a0751919e2be47a073f58d2a012a SHA-256: da5340e939090493e91971a4267fde25ac0c1d9762d3798585de2a4fac710a9b
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a social-engineering lure to install browser updates. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely to download further payloads or phish for credentials. The presence of multiple unknown URLs points to a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://talaa-obour.com/webmisr/uploadwebmisr/file/sepokumonesedem.pdf In PDF document text
    • http://onfireinteriors.com/userfiles/xegoma.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/turelomufokisisikal.pdfIn PDF document text
    • https://gangnampools.com/contents/files/1347094533.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/titedifiditijup.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/gukisexezali.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/wekekazavexikapuvujazen.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/73889926254.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7375902650.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/dewubobuwulutudetigevij.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/4387178330.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210904145004.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/dugizagabuguvera.pdfIn PDF document text
    • http://fitviewer.biz/files/file/47921427925.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kibasowivutaxaxaluru.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/sivajonibesajuzugesej.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/30533017116.pdfIn PDF document text
    • http://contua.org/userfiles/file/zivezilolofozuje.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/87303557819.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/zofufivapebuzomidur.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c7145235---73757655150.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/niminugex.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dedalapuwutusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=edit+source+code+chrome+androidPDF 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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10672 bytes
SHA-256: d73f8c220f1082fcfadb31351b4ce8eba738f6f40cdec04f07067dcd86937842
font_01_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 17036 bytes
SHA-256: 598dafa926914a7e9d45d6c2fd3323bb34cc5ea1431c90fe330fb66762a2fb9d
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1