Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9df66d9334674f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-10 18:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6193bb595407a4f70885a3e94b75ed SHA-1: 7acf68e6ea5c00060aee58868544120ec828f170 SHA-256: 3a9df66d9334674ffa31b45c176b608a15cb1aec9e346aeed1d94923052f3ec7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used to redirect users to malicious sites or download further payloads. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan activity. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest a coordinated effort to distribute malicious content through a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/123?utm_term=python+language+pdf+book
    • https://cdn.sqhk.co/zogobadakedu/ggJwagc/packers_preseason_schedule_channel.pdf
    • https://cdn.sqhk.co/lomasamube/cidjbif/zopew.pdf
    • https://cdn.sqhk.co/jobezivozuf/gfnciie/77707216922.pdf
    • https://cdn.sqhk.co/fulaxanew/4iejgEl/most_extreme_mountain_bike_race.pdf
    • https://cdn.sqhk.co/sotogademo/fiSiii8/zerubokotisagozijaku.pdf
    • http://ultra0.space/nigodaxabofa0v5kl.pdf
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/wupidoxaxurit.pdf
    • https://cdn.sqhk.co/wosipuvetot/uCHlhbA/nelovoledig.pdf
    • https://cdn.sqhk.co/zunesunatiri/hcgiXu1/73840281055.pdf
    • https://cdn.sqhk.co/jimumakevaji/hgFjj8N/tugiravipozesubivegukemel.pdf
    • https://kuwomodelinero.weebly.com/uploads/1/3/0/7/130776449/negewod.pdf
    • https://cdn.sqhk.co/denirinodo/ed9hbH8/pinball_free_download_for_windows_7.pdf
    • http://probnik1313.tech/vineland_iii_online_scoringcz614.pdf
    • https://cdn.sqhk.co/wekaradukuve/go4ighj/gimubelalutovuli.pdf
    • http://fullhp.info/gardens_of_the_moon_summary_reddit1cwll.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5543f681-a98a-4ebe-9c74-f8e44b37515b/can_optiplex_745_run_windows_10.pdf
    • https://s3.amazonaws.com/wuniku/xasesepamiluligupo.pdf
    • https://uploads.strikinglycdn.com/files/1886376d-64a0-4b3f-b03e-634c34d12335/vicks_starry_night_humidifier_filter_tray.pdf
    • https://uploads.strikinglycdn.com/files/63807d96-9f45-4944-ab59-a30eb9c7e1be/53832954945.pdf
    • https://s3.amazonaws.com/jevedijadiki/lizisipafivis.pdf
    • https://uploads.strikinglycdn.com/files/9d3493c7-f59c-48cd-a2fa-b7c3e99f2e06/ponobajona.pdf
    • https://s3.amazonaws.com/penefelomiju/iphone_app_business_plan_template.pdf
    • https://s3.amazonaws.com/juwofuxufijup/mijesuronefotodep.pdf
    • https://uploads.strikinglycdn.com/files/58b9f562-6d41-4006-9392-e5c72f771b5d/teguforulovodulavabegisif.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010957.bin
7ea4fb2a04e83187527a6effc7cfd92cee3a9d43e3031dd3fe83231d5f6432d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 5336 bytes
font_01_sfnt_off00011b8d.bin
832a14266b2e05870a603373c9a632c4b73ce9ccb4bd1fc7d6c2bf87e9e8206b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 12140 bytes

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