Malicious PDF — malware analysis report

Static analysis result for SHA-256 940faf83c8ce4dae…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 13:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 9d2ab6643e1c09679df514646eb85ea5 SHA-1: 04a18b808daf823f92eb99941c039206327831ec SHA-256: 940faf83c8ce4daea9caab1917a15c132259916b8dec3bd4b66e99976ba04820
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://markaoyun.com/calisma2/files/uploads/46969058514.pdf In PDF document text
    • https://willes-gb.com/uploads/files/202109101552556027.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/71371608457.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/31974054747.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109011017411375.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8d0e4a7784c97c7915dc271a0f798a5c.pdfIn PDF document text
    • http://www.77ice.com/upload/files/tumivozenibifa.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/kesuzinufebemoluju.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/82621185956.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/15741812400.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/zugefopezitemaligaxa.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/85811351125.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/42441805573.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/68328632717.pdfIn PDF document text
    • http://sinostandards.net/upload/files/32513704336.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/sizodopixumubevukugedimub.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/viriguniwosijewefizugafi.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/juzafopowufi.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/59265549063.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210908183615308.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/121745133.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4506d226---feridoteradez.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/bagol.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/62pfmt6d4sf3k0c1h2am8r1gb5/pijedusoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tamilrockers+2021+movie+downloadPDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 19176 bytes
SHA-256: d515c628320a565ef6975e2b85f8db4bb0347f0d79c9b26d3089ca129afc068a
font_02_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 10936 bytes
SHA-256: 9a3c9f72b62473289e8497882e7b7d235ec22eeca741836add78b151cf537d39