Malicious PDF — malware analysis report

Static analysis result for SHA-256 5041bc3d270b480a…

MALICIOUS

PDF

85.9 KB Created: 2021-05-10 00:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9978f0b1e79c14fcb2c2e33b6414a715 SHA-1: 50c30d477813a993a3ff08dd30df7091eef2ec07 SHA-256: 5041bc3d270b480acc7786ef5d20e07103b4282df1c4a78a6ff65a6a21b75c7e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of a URL with a 'utm_term' parameter implies tracking or a lure, potentially related to the document's title.

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://baarspo.ru/strik?utm_term=how+is+dramatic+irony+used+in+romeo+and+juliet+act+3+scene+1 PDF link annotation
    • http://bupetud.xyz/piniguxilisanarid153m.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/xisejipiwirik.pdfIn PDF document text
    • http://velesvoyage.ru/this_is_where_it_ends_chapter_17_summaryyhign.pdfIn PDF document text
    • http://cosmeteca.com/pit_bike_motorcycles_for_sale98nd9.pdfIn PDF document text
    • http://bibuwobu.22web.org/community_acquired_pneumonia_idsa_guidelines.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/rimedol-ribex-gexeronuzenadu-nusitixudu.pdfIn PDF document text
    • http://libralab.digital/dazujuvijasatiboruzogikob0cei.pdfIn PDF document text
    • http://sudebatuwilazet.iblogger.org/prayers_to_break_generational_curses.pdfIn PDF document text
    • http://dokovuxumev.22web.org/digital_multimeter_dt830b.pdfIn PDF document text
    • http://kalavar.xyz/loveliest_of_trees_sheet_musiceyf0l.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/what_do_the_7_rooms_symbolize_in_the_masque_of_the_red_deathb3ft4.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/vekisunadejo.pdfIn PDF document text
    • http://carins.info/jivazisuwuzisovutot5spl.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/93355728459.pdfIn PDF document text
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/tilumezaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wopovivatidudez.epizy.com/ethnography_of_speaking.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/journal_anemia.pdfIn PDF document text
    • http://suxuxuned.epizy.com/godrej_company_organisational_structure.pdfIn PDF document text
    • http://duvexarido.epizy.com/be_the_centre_michael_frye_lyrics.pdfIn PDF document text
    • http://mumamame.rf.gd/american_english_file_3_teacher_s_book_free_download.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_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 5532 bytes
SHA-256: 7cbc2d901021cd0a21e900e0afc2b21511a71472b94e545f7b162b4935a033ce
font_01_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 11160 bytes
SHA-256: d66ea6233b7fb1ce2fa11fc2290dfebe2e389c0487ff3ab7cdfa2b6168b0af19

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