Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cc77e9d40e7848…

MALICIOUS

PDF

93.0 KB Created: 2021-04-06 18:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52bafb5d1ce94272a71943431741c9a SHA-1: 3c049093ad67deb56567f01fa13081f4ccd99e32 SHA-256: 66cc77e9d40e78488b0663c5a8980e0989a4ff3e2e99752a8e5c1a4e9ecd249d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to reporting analysis results, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/aws?utm_term=how+to+report+regression+analysis+results
    • http://hookup668.site/kazade9otp6.pdf
    • https://cdn.sqhk.co/bawijodol/jgxjgf7/crossroads_church_oakley_phone_number.pdf
    • http://omerkatanalp.com/filmora_9_apk_download_pcoud7s.pdf
    • http://marketeuro.pro/wojedidaf8trdc.pdf
    • http://vijoviresole.mywebcommunity.org/lamumorokelegosubimapusot.pdf
    • https://cdn.sqhk.co/nedupugifuka/SGQjaom/ringtone_samsung_s8_free_download.pdf
    • http://plafond.xyz/vamifazavawapasvjhrv.pdf
    • https://cdn.sqhk.co/bagudivibi/R5LdBgX/bikovu.pdf
    • http://uscreditreport.info/fejiduvifuxobimakananerfxdgr.pdf
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/4702782.pdf
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/6200600.pdf
    • https://cdn.sqhk.co/numokafas/ifwBeha/84877201826.pdf
    • http://igafnd.org/how_do_i_change_my_childs_reading_level_on_epicexp11.pdf
    • http://coolvdomaion.online/english_learning_app_free_download_for_pcyk0i0.pdf
    • http://arfesopt.com/202525290497noxn.pdf
    • http://dumubemajizukov.medianewsonline.com/amir_levine_rachel_heller_attached.pdf
    • http://pipvip.ru/125906264762fgtj.pdf
    • https://cdn.sqhk.co/konosoka/cKslifT/download_apk_3d_cute_cat_live_wallpaper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_4eeef1e00fbb4fe4ae1b31d6f7d11717.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_1f0ec58e6bcd4157b99e56425ba2106f.pdf?index=true
    • http://wifofevowogak.onlinewebshop.net/21933995158.pdf
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_9ed21a277ea14355969dc63f461ee9a1.pdf?index=true
    • http://fogokenum.onlinewebshop.net/64340498349.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_e813b2762a5444669ef0ea6907614a18.pdf?index=true
    • 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_off00011789.bin
cc21100ed128f444f1666efc3fed6222411d268b344275e0e9dcd1d849943fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 5144 bytes
font_01_sfnt_off0001292f.bin
a395b9ea001443ed1a5ca2ce14fb24f6bb557da7b451086ea932f9953d3f1fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 11624 bytes
font_02_sfnt_off000150be.bin
503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150BE 16060 bytes

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