Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d73cf90146c19…

MALICIOUS

PDF

83.9 KB Created: 2021-04-19 22:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 18f480c966d82ec1c53e60a32c86e577 SHA-1: aabe8edd29d06ffabbabe24ee68070db8d32b24b SHA-256: 501d73cf90146c19ba6379e2dab9827ff2d0be8094398481c55d8ed5f86695b8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to printer maintenance, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=hp+officejet+5610+all-in-one+change+ink+cartridge In PDF document text
    • http://ruwemipuwev.mypressonline.com/8642211792.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/la_boite_a_merveille_resumuh9sw.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/fjcsjbO/69193082407.pdfIn PDF document text
    • http://helpforteam.com/cmo_poner_globos_en_un_posteceqqy.pdfIn PDF document text
    • http://1xbets-reg.site/zixapaliwaswohku.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/zubekoxuvikiroxot.pdfIn PDF document text
    • http://inertbhjbj.ru/93979947178b5uzk.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/ancient_greece_worksheets_3rd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/bib6ii0/the_asteroids_galaxy_tour_fruit_download.pdfIn PDF document text
    • http://tixshopclub.space/what_is_ssr_list_in_stocksu0suc.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/is_lemony_snicket_related_to_the_baudelaires.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/kaguriferupawex.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/gepasadenafudi.pdfIn PDF document text
    • http://navalny.design/what_is_the_main_topic_of_the_lincoln_douglas_debates4yumu.pdfIn PDF document text
    • http://fkpravo.ru/44934492361uyxg0.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/hdibV0H/amino_undertale_espanol_para_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_051f1f4318be455495f0f7bbf93dde73.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_dd6bcb58cefd4d4f834c8ba0de21d2d5.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/les_objectifs_de_l_amnagement_du_territoire.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_4bb1fde15c0f4730ad5d55feb5aab2bc.pdf?index=trueIn 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_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 5844 bytes
SHA-256: 7b6c6830a68e140d4928b2150a9c588f65c77fd9785a3daa0ef725fc9b5616d3
font_01_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 11240 bytes
SHA-256: 99b4a3292313f0dd954db27e1bb52464ff04d0f8f81487aa057e5dcefeaa1886

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