Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef823fe3d2fb86d…

MALICIOUS

PDF

92.9 KB Created: 2021-09-13 08:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b1c61338368a80477dbfd5755526021 SHA-1: f0d6b8b0fb250dd4e7090ab346df2d7badbc324c SHA-256: cef823fe3d2fb86d522d599e0851d7e5f3563982a06e47e4805500d45d7c3317
142 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, suggesting it is part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315201e6a0b---dojabibi.pdf In PDF document text
    • http://phamtrangia.site/upload/files/gasuxopedinesoga.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/9796137200.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/34332351236.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/ruxexikokutezipubigevi.pdfIn PDF document text
    • http://oris-am.com/editor_up/pajuzomotunivujuguvis.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/4918138253.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/gidovibelemax.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109010245069854.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/pesisekizidasukamunazipel.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/votesesegowe.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/90192244704.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/maguwazipadonudoturewu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/wawonarobalivirim.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109122219499532.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/8179835825.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/60988324673.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/ritage.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/27158564408.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/36981940140.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864b7d2ca6---50428466151.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/lelivaforigigofuson.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70399871908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=es+file+explorer+lite+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 24584 bytes
SHA-256: 5db8c888d64e1a5a1419eb994176cf817a8af561bb67c79fe1902a86dbe97b4b
font_03_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 10424 bytes
SHA-256: 78822cab1f14773adab16db31260664296ed82ecbd069104498454b5634bd802
font_04_sfnt_off00014f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F24 16340 bytes
SHA-256: 52dd5067e004a5093f19d447f9e7e67fb382ccd5a9785c067e4d8a9ce714e481