Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb0b81c5d4ebbc5…

MALICIOUS

PDF

81.6 KB Created: 2021-03-20 14:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ef4e7385a2ced3b414eaa28410622e35 SHA-1: e4c5e50f2cf93a47dc41596a04fea4b054242e07 SHA-256: 5bb0b81c5d4ebbc5c95d0d4fab0e6b955984c011d83e526c32a19876c65725d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a malicious intent, possibly to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=types+of+boundary+conditions+in+heat+transfer+pdf PDF link annotation
    • https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/352f5438dc380d4.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jgEjfc6/business_game_200_rupees.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/2lfijt8/espn_nfl_score_predictions_week_2.pdfIn PDF document text
    • https://xidevakunowun.weebly.com/uploads/1/3/4/0/134017194/5d8e8d35de4f5.pdfIn PDF document text
    • https://vizexetu.weebly.com/uploads/1/3/4/8/134864552/jajefibofix.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/2cc5ac39d.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/Gwz4igw/modulus_equations_and_inequalities.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/2hjje3B/endless_war_origins_game.pdfIn PDF document text
    • https://cdn.sqhk.co/luvuxokam/ggwOhaC/nintendo_switch_just_dance_phone_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/Rv4WjaA/tefimelomepuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/juropenux/QlidGwn/fovesevafuje.pdfIn PDF document text
    • https://setuzenizenu.weebly.com/uploads/1/3/5/9/135973655/tigifusemawunivuw.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/big_easy_turkey_fryer_instructions.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/maytag_neptune_dryer_not_drying.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/EijtVhg/fuwopasopedetud.pdfIn PDF document text
    • https://xuxerativizujaf.weebly.com/uploads/1/3/1/0/131070719/jinadebafe.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/zopuped_jujegot_besejitapu_senujurovefes.pdfIn PDF document text
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/2950682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dufojamimusim.atwebpages.com/how_to_overcome_emotional_abuse_from_your_mother.pdfIn PDF document text
    • http://kagijido.myartsonline.com/english_grammar_book_download_for_ssc.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/30133534771.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 5284 bytes
SHA-256: d6494bb2f1d50e1acb4455200a9e464942a490843416ac36597a4063575e0311
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 11180 bytes
SHA-256: 03accaaba69416ee02af4052aa47554b0d5a129767b2adef0eadd8a52c69c005
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.