Malicious PDF — malware analysis report

Static analysis result for SHA-256 617ecd15c418b935…

MALICIOUS

PDF

113.6 KB Created: 2021-01-24 13:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e67f4aa77b07058c28ce8d121076067a SHA-1: 3cd45e404c901503ee5e7a7cf9925dbe45af4f81 SHA-256: 617ecd15c418b935b5de98b280acfefd22d8794c2b9b598d01fc1262d93b1972
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, and heuristic analysis indicates it is a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the malformed stream length and embedded URIs indicate active content is present and attempting to exploit vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://traffset.ru/aws?utm_term=bt+group+annual+report PDF link annotation
    • https://cdn.sqhk.co/benibavagoge/i8ygjjc/81160465165.pdfIn PDF document text
    • http://iminn.ru/18478462888r2sh0.pdfIn PDF document text
    • http://bonusiotsbera.online/45051889302bkkdl.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/RibvKRR/al_green_songs_youtube.pdfIn PDF document text
    • http://bluetea.space/warrior_notes_tv_subscribe9wevx.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/tghhghb/67424733291.pdfIn PDF document text
    • http://mybestchan.online/56435376228o6wcw.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gi5Myih/rugby_league_19_gameplay.pdfIn PDF document text
    • http://autobaff.xyz/hack_green_farm_3_game_guardianqoxat.pdfIn PDF document text
    • http://cmbmarketing.agency/story_saver_for_instagram_story_downloader_apksu78k.pdfIn PDF document text
    • http://wspring.space/the_thing_infection_board_gameb23g2.pdfIn PDF document text
    • http://extrameets.fun/4632992740vzjgv.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/jgjfTje/90884718616.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/MY7jge7/blue_sky_girl_squadron.pdfIn PDF document text
    • http://ru-en.xyz/minecraft_slenderman_mod_1._5._2hkk9n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/tizewabekibupoke.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/tosuwefazojewapakano.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/afirewall_call_and_sms_blocker_full_apk.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_off0001811e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811E 4856 bytes
SHA-256: 9e5cf35bec26004015863b8546683aaef9b924282821d0990fcc54603eb62d43
font_01_sfnt_off000191b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B6 11580 bytes
SHA-256: e41405eb1e4f170b1eff35ee9a52c1837c787613673720c4a18e33feef89ef87

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