Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a313e1aac82fc81…

MALICIOUS

PDF

76.8 KB Created: 2021-02-02 04:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: df1526b87acee4a2b926d2e0afb06eb6 SHA-1: 72025ba958ef0c88f31a64c64f236ed3df867a31 SHA-256: 6a313e1aac82fc8172bc3d8a30fb168bfaaf5b7ae5985278df90f86450c014cd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'Arthur Ashe stadium seating chart', designed to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=arthur+ashe+stadium+seating+chart PDF link annotation
    • http://mscredit.info/mastering_your_hidden_selfvx1pi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5ffe11231da2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xafigozenusu/sjjhjMw/kapunawafikekuvexiza.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/jhhjjje/yellowstone_season_3_episode_7_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5feea6a1f0aa2.pdfIn PDF document text
    • http://biomaniks.website/future_perfect_vs_future_simple_exercises78n74.pdfIn PDF document text
    • http://smeh-mif.space/neighbor_home_smasher_apk_android_oyun_clubm0nkc.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/ia9ha2Y/silverback_gorilla_diet_for_humans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_5fe632ea4bdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_601608147643d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380530/normal_5ff6c4b40c2b4.pdfIn PDF document text
    • http://pasetbs.xyz/butwal_smart_approachamnqf.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/cieE8M6/iphone_notification_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/uididb8/leappad_platinum_youtube_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funasuruwet.epizy.com/9291376304.pdfIn PDF document text
    • http://zabobenalug.rf.gd/intro_music_video_maker_pro_apk.pdfIn PDF document text
    • http://duwagisu.epizy.com/crested_butte_restaurants_guide.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/purujegoxezeratifizi.pdfIn PDF document text
    • http://vufilupirudote.rf.gd/76255453095.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/framed_ink_free.pdfIn PDF document text
    • http://supegawezokex.epizy.com/charette_lake_nm_fishing_report.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5312 bytes
SHA-256: 642db85ace15fb9224a5849f35e35e27da638f0996ea190b5e7fe6b70ec825d8
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 10980 bytes
SHA-256: 5e2c0cbd8786288c09620d6e730eaf8ccfb6a96762a5940226798fbf39334227

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