Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae0da0ee8680db4…

MALICIOUS

PDF

82.0 KB Created: 2021-05-13 03:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f783a18121e3f35fdecae33da6f32da2 SHA-1: 9bb2a32c7a00e09e237e41673d9e52a8116a5600 SHA-256: 1ae0da0ee8680db45753463457c0f12d810dfb68d4066be28d1b714329f021c2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and known malicious redirectors, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=technical+writing+jobs+healthcare
    • http://hopecommunitynaz.com/aviation_cyber_security_toolkit_download1amld.pdf
    • http://profibrend.ru/navy_and_marine_corps_achievement_medal_citation_formatbf9mj.pdf
    • http://rujisuki.mygamesonline.org/hp_officejet_4630_ink_target.pdf
    • http://pidawudimo.scienceontheweb.net/elements_of_statistical_learning_2nd_edition.pdf
    • http://bukudix.getenjoyment.net/fatunidivowutigakofijub.pdf
    • https://cdn.sqhk.co/woteruzid/RAhaZgW/zuzakemivoguma.pdf
    • https://bofisolipog.weebly.com/uploads/1/3/4/4/134438855/jufexuwotowukelat.pdf
    • http://sijemogezabusa.sportsontheweb.net/zozapazed.pdf
    • https://cdn.sqhk.co/jatizaru/cigjcjc/fitbit_versa_2_smartwatch_walmart.pdf
    • https://tuxazapewim.weebly.com/uploads/1/3/4/8/134846749/kugigumogorejibipi.pdf
    • http://wulutano.mywebcommunity.org/cimetidina_mecanismo_de_accion.pdf
    • http://pikufufunuti.scienceontheweb.net/muwosefefedaxugexukorap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vitelitubovuluj/crossword_answer_for_british_verb_ending.pdf
    • http://xepatodop.onlinewebshop.net/dogafabavifotomevitadexez.pdf
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/kikanobumerolek.pdf
    • https://s3.amazonaws.com/lixisariwulo/fabadujumalovo.pdf
    • https://s3.amazonaws.com/zumomasugipeno/jungle_bouncer_fisher_price.pdf
    • https://s3.amazonaws.com/dabatisew/chhaya_film_song.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83f.bin
8b5e84c222d7535ac3f2e999f424dde44af6ea1d50eab5495e97472494b6d761		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 5108 bytes
font_01_sfnt_off0001099a.bin
ff70c126b45c7314257122913eb60083a23a0489763941414cefd65e6b557113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10308 bytes
font_02_sfnt_off00012cad.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 4324 bytes

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