Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b05f9253913f637…

MALICIOUS

PDF

71.7 KB Created: 2021-02-11 06:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 748c4bd0f0fd4953335d866d6a68f95b SHA-1: 5e734524f5deecf5fee477d7dea9469f525c15ae SHA-256: 8b05f9253913f6379f00a8573da244460ed9e0798014ad36256c32fe17ae1fcb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to domains associated with link farms and disposable hosting, indicating a malicious intent to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm heuristic strongly suggest this document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=dedalus+sibi+usp PDF link annotation
    • http://obschee.xyz/international_day_of_the_girl_2019_hashtaglp200.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/1eSjfZp/11105016038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373248/normal_5fec3469420fd.pdfIn PDF document text
    • http://copyrightshelpcenter.com/supportive_psychotherapyar4o2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5fcd18d4a760c.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/hoP7TBb/uc_browser_online_video_free_download_app.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/khbjeda/fort_squad_battleground_survival_shooting_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_602002463580f.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/3iijcz9/66125801770.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/giiaggL/art_therapy_degree_utah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465398/normal_5ff6510cd7d6e.pdfIn PDF document text
    • https://cdn.sqhk.co/puxobaku/jiiiZg9/dazerotoferizari.pdfIn PDF document text
    • http://hesap-al-sat.com/razerawliij.pdfIn PDF document text
    • http://50offstore.info/mimizay6a9r.pdfIn PDF document text
    • https://cdn.sqhk.co/gizafimode/hmam0pT/nuvuvarexelu.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/tanapilamaxi/bird_alarm_tone_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/bijli_giri_remix_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/best_rap_songs_ever.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/cell_organelles_structure_and_their_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/bhagavad_gita_in_english_with_meanings.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 4996 bytes
SHA-256: 3f51915f6a564c244f3601931bb996a36801f44b281eed787f14b3c34be60925
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 10292 bytes
SHA-256: 48d69b20e8c11ce8fbb72d3d505feec5f1859406854c48156bf117dc38382a05

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