Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9fb8d8f961555a…

MALICIOUS

PDF

78.8 KB Created: 2021-03-23 23:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a0da7c7f41fffb65f6edac9b33b3a67 SHA-1: 4ac25112d519ec028ced6308da7a61d33899723b SHA-256: 5a9fb8d8f961555a3d3449e21693798d20853c33cac44f37548fa4abab604dfa
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 other PDF files, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=morphemic+analysis+examples
    • https://cdn.sqhk.co/zikonidenijo/dzDU1xA/63530024569.pdf
    • http://salonlabs.xyz/96087962064a4is2.pdf
    • https://cdn.sqhk.co/penunotati/iGiNih3/23907919657.pdf
    • http://mixed-rootwork.com/batman_2_tamil_dubbed_movie_freef6424.pdf
    • https://cdn.sqhk.co/toriwogadej/ibjija9/16903839176.pdf
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/nemefigasuro_bijimutuju_sekinatilawaw_vudoseniwilajok.pdf
    • https://cdn.sqhk.co/negixakozaxu/j1jvihp/amazing_facts_in_the_world.pdf
    • http://ygrash.website/beat_making_app_apkxj79t.pdf
    • https://cdn.sqhk.co/lapefuxolu/RpWWThj/51710388197.pdf
    • https://tedisizizifem.weebly.com/uploads/1/3/4/2/134235801/77f6b869b.pdf
    • https://cdn.sqhk.co/gadewekunel/kGgijgl/strategy_tactics_magazine_download.pdf
    • https://cdn.sqhk.co/kuderoxuz/bUhcajj/mechanics_bank_auto_loan.pdf
    • https://cdn.sqhk.co/towevefizub/hjidB9O/56220353767.pdf
    • https://cdn.sqhk.co/suvezadamut/jfjdBjf/game_server_hosting_control_panel.pdf
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/liwijozet.pdf
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/2491509.pdf
    • http://testvvd.xyz/jodugoramitapiu9y0v.pdf
    • http://nextauto02.ru/how_to_start_hamilton_beach_brewstationfzy08.pdf
    • http://servisvds.ru/555089787934tmr8.pdf
    • http://gk-kuban.ru/50202895157vbf9g.pdf
    • https://cdn.sqhk.co/zosaremarebi/8gcuifq/color_splash_wallpaper_hd_mobile.pdf
    • https://cdn.sqhk.co/fuwufupi/0I3DhF9/mermaid_photography_props.pdf
    • http://lnstagram-blue-ticks.com/why_was_alexander_the_great_famouss4dat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8f.bin
55809f7c4c84c61971f980004780c40c5bd3ff8155a7584a74557654f9707f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5348 bytes
font_01_sfnt_off0000ffaa.bin
f0e9baf5115a114590d8070d86da878036565f6ac34afbd9898bbfdad34ee74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 14700 bytes

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