Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ebfaf5e533c59…

MALICIOUS

PDF

92.5 KB Created: 2021-03-13 19:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0a8fc7912e9be7506b6291ae8b43e63 SHA-1: 7c33b214521857495180968c3be7a4da6e255623 SHA-256: a76ebfaf5e533c59592d4dadc8375ed57efccba742968998568d6930dcb9b19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=heathkit+sb+200+manual
    • https://cdn.sqhk.co/gakilofod/9XjaVWO/80676512216.pdf
    • https://cdn.sqhk.co/zajagatetode/iaiggic/vr_space_flight_simulator.pdf
    • https://cdn.sqhk.co/zexoribuj/hrXiaSl/zepapetadi.pdf
    • https://ditaziretuviki.weebly.com/uploads/1/3/0/8/130874055/09cb0.pdf
    • https://cdn.sqhk.co/dabozijide/TUijjgx/26234865726.pdf
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/vadaru.pdf
    • https://cdn.sqhk.co/zalopubid/bicjgjh/wonakevejewemaji.pdf
    • https://cdn.sqhk.co/sugojipo/gePmEk1/suvurijuzesunafunuwide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd69542c-0a0c-4074-beab-d6f43cbd45f4/zagg_folio_case_ipad_pro_9.7.pdf
    • https://uploads.strikinglycdn.com/files/baef7e95-140f-4a8f-9dc3-b171731ed203/how_to_fix_corrupted_database_on_ps4.pdf
    • https://uploads.strikinglycdn.com/files/6b287de9-b4b8-46ac-9dc3-bb5844080167/98997994057.pdf
    • https://s3.amazonaws.com/sitok/bleacher_report_nfl_picks_all_games.pdf
    • https://s3.amazonaws.com/ronenitevodo/bcbs_ny_medicaid_prior_authorization_form.pdf
    • https://s3.amazonaws.com/vifusupegiza/fesokipirivatulem.pdf
    • https://s3.amazonaws.com/wovisak/arteriografia_mesenterica.pdf
    • https://s3.amazonaws.com/suxiweke/88621160175.pdf
    • https://s3.amazonaws.com/wokesabisevo/agriculture_urbaine_afrique.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011859.bin
2040051f5cce3f24a7da80716dfddafeb92500c01962fe729915d5a9c88329c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 5268 bytes
font_01_sfnt_off00012a19.bin
f5d2193251fa95d8c53de9e98859984076ceadd433a63025922e06f20d928477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 11056 bytes
font_02_sfnt_off00014fe0.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE0 16204 bytes

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