Malicious PDF — malware analysis report

Static analysis result for SHA-256 f644580df0aceb62…

MALICIOUS

PDF

77.5 KB Created: 2021-02-16 12:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 50b7a70c8f35f6399fb79dc76db4c57f SHA-1: 3fcaac28f5730a0956af7dde975dedd34ebac2d8 SHA-256: f644580df0aceb625b062c32c48493983c0923cd2523834c15a8779f890ede70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, often disposable, domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, with ClamAV confirming it as a 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=critical+thinking+company+reviews PDF link annotation
    • https://cdn.sqhk.co/vimerokil/goO9CUr/undertale_wallpaper_for_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/jgwheid/83620371665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_6022e91ee2707.pdfIn PDF document text
    • http://rollernefrit.xyz/41055214633vjr4m.pdfIn PDF document text
    • https://cdn.sqhk.co/zavipudajose/hcD15GC/67314925914.pdfIn PDF document text
    • http://andyhong.blog/rolling_stones_logo_black_and_whitenkncd.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/gjbgUgh/woxejasobebofigu.pdfIn PDF document text
    • http://italiahot.fun/cisco_packet_tracer_7._2_for_maclyimf.pdfIn PDF document text
    • http://seamanygau.best/minecraft_world_editas0ct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5fcb3839b0481.pdfIn PDF document text
    • http://natlab.ru/972561857655xjms.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/gh7icic/gacha_life_youtube_videos_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ic4zjeO/52214054634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_602b4fbd60184.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/dazuxujepov/can_you_apple_music_playlists.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/77615604789.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/answer_to_today_s_jumble_words.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/posumarudatijavoragilijut.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5572 bytes
SHA-256: 8ca205937d6329a891e78f4d9cdb840929df13b4030f05c41e049f5fdfa44858
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 10356 bytes
SHA-256: 4a274c318353847c2669a5af6571f34c4c90a9d23e889e676faa07cebe055e98

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