Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da51cb0e9038fd7…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 07:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280739b272984aa7213e51dc0a60620a SHA-1: 7795b3af20fb43a8922c4dd7a2aa0bf205cf7611 SHA-256: 7da51cb0e9038fd71d38fa426d35eee62d502ea90d6e73813b94e39bb669feca
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 high likelihood of malicious intent. It contains numerous embedded URIs pointing to external websites, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=ms+miranda+evans
    • https://cdn.sqhk.co/memenewo/TjjjjEU/75555843608.pdf
    • https://cdn.sqhk.co/tobijoge/hW1PEYw/qualification_as_rogue_offline_game.pdf
    • http://kafofal.mygamesonline.org/how_to_get_mental_health_help_for_free.pdf
    • http://zokidinodajives.getenjoyment.net/51966815365.pdf
    • http://ravovenovibu.medianewsonline.com/chemical_engineering_technical_interview_questions.pdf
    • http://sukuwodexi.scienceontheweb.net/flowcharts_and_algorithms_in_c_programming.pdf
    • http://votilabelomebom.iblogger.org/38416528543.pdf
    • https://cdn.sqhk.co/powirafawume/iHUiguK/movie_night_at_home_food_ideas.pdf
    • http://topitoxituzoju.iblogger.org/world_history_textbook_high_school_answers.pdf
    • https://cdn.sqhk.co/dogutadova/iauiijb/cheat_8_ball_pool_iphone_2020.pdf
    • http://jorowijedo.mywebcommunity.org/what_does_arrested_development_mean_in_biology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_e7b449a5d71c49c785fc34460c09793a.pdf?index=true
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_027ac4a4d9694b8ebbe4d18b85a49070.pdf?index=true
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_5107a554cf624164a2b936c788263fdd.pdf?index=true
    • http://josetevuj.epizy.com/nixiwuwimakaloxature.pdf
    • http://povodakav.myartsonline.com/kejugesorimo.pdf
    • http://xipanizi.myartsonline.com/what_are_the_5_main_personality_types.pdf
    • http://nojatajof.rf.gd/overcoming_gravity_book_gymnastics.pdf
    • http://kifesafijupesob.onlinewebshop.net/tepademifibimaxelawogibi.pdf
    • http://lujubozugib.epizy.com/62314610415.pdf
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_b0118866dce043a9aa827f929deaa930.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_5028c12d6a4a472c85f92e1ffaf5d3f8.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebda.bin
176395d2dc81122df33afd55c2be1a67c8441efdff77003aaba2045681cffd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 5004 bytes
font_01_sfnt_off0000fcd4.bin
0f7cf99b083f6fa3072e67c174a3062e9e9ccab9f02c846bf63fe5f3e7d33b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10872 bytes

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