Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e3ba12ddea3d75…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 05:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 744700b56f92cfc6e91bc3cf5e48d4f7 SHA-1: daa92c20c30d43ba1ff88c6d0f805ed87864d6aa SHA-256: 58e3ba12ddea3d7514777d178454081a3f1049d2e3bade568337e38984e068e6
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with a high density of external URIs, many hosted on disposable domains, suggesting an attempt to direct users to malicious websites. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sesconbs.org.br/ckfinder/userfiles/files/9935729053.pdf In PDF document text
    • https://adikkeempat.com/contents/files/79306279820.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/lawiganazotojusubuketedaz.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/kedini.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/11631651030.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/3693240207.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/gulufaw.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/desilefutefefudujipapu.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/72636080044.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/60312644184.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c6qrcjecfi7ktfh312sgkmlc4o/73054792462.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/91566792752.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c4c36e75---vemofunomogikixifap.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/26410873622.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/51687575890.pdfIn PDF document text
    • https://primer-spb.ru/files/files/sopotogototalufusulit.pdfIn PDF document text
    • https://aromamarketing.md/img/files/rulasoguwiwapemerosofim.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/28856649269.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/retulug.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/39688562685.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/runipifagip.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109131331219894.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/nebubozotigezenirawose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=linking+sentences+in+essaysPDF 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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10300 bytes
SHA-256: 41ad42cfff76f1d1e4f0b53377ef684d6c720b76ecf784e42df43a2be435a565
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 17704 bytes
SHA-256: 2ffdf7097a6777b8c3550c43046d9310fbc4e5f78c3bbe5b3defe60165829358

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