Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b5f7629e59f4f7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 15:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b59e61eb30e8e1de1248f83d02feb783 SHA-1: 18a93c001686d499e8f27b8e4afc33535a98327f SHA-256: 70b5f7629e59f4f7efac66c477a218f3882fb9137514d71d64b14659e50a9b3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smilaxlabs.com/userfiles/files/66107837313.pdf In PDF document text
    • http://baove24h.org/upload/files/gesuvubigegar.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/17273445597.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/71546649471.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/17176791111.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/xogamawakojivebojax.pdfIn PDF document text
    • http://chemicalengineers.ie/images/ziredinigiridudozadaxob.pdfIn PDF document text
    • https://jensbrode.de/files/file/fogubomatizezixi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9738b8f995dad0fb1f037bfcf6516212/leziduxigifago.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/gevuvawixofawi.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/86557775192.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/dozejakebojopawexitorife.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zukenuxoxobe.pdfIn PDF document text
    • https://sergiomauri.com/images/file/giwat.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/87614201654.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/1580614168.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2348b7790---10771765281.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/32302815310.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210905_06F98BA1EB968CE9.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/liwunonutemumipadu.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/jojid.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/vigajegabora.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/30081384880.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/16950972030.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/77741120031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+online+help+chat+freePDF 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_off0000b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 10532 bytes
SHA-256: f84ab28097b1994101d18726f3e5dcda4916a5c389097e6e0c96173a2f9ba475
font_01_sfnt_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 15408 bytes
SHA-256: 023c7b782a99efae4c5d3ec112f73642482d2d8174f83c4edbb062b867fa5a69
font_02_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1