Malicious PDF — malware analysis report

Static analysis result for SHA-256 8443d735814c2b93…

MALICIOUS

PDF

73.0 KB Created: 2021-03-03 14:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 883e6cf9fec494a40546a26271984789 SHA-1: 7919fe1bc782e6bc4270a23ed6bc932a40ffc929 SHA-256: 8443d735814c2b9384ae24d760c67d752a7da1b467ca07cdb67f9e486ab7526b
126 Risk Score

Malware Insights

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

The PDF contains multiple URLs pointing to disposable domains, with one URL specifically crafted to appear as a guide for setting up a Denon receiver. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/123?utm_term=how+to+setup+denon+receiver PDF link annotation
    • http://dosijefa.mypressonline.com/muwarikirow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5feeb6fb24f52.pdfIn PDF document text
    • http://biomaniks.website/the_9_best_flirting_questions_to_ask_a_girl_to_get_her_excited1z2jp.pdfIn PDF document text
    • http://gvidilon.ru/the_tragedy_of_the_commons_refers_to_the_phenomenon_where8zp5x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602097f4369ab.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/caracteristicas_del_marketing_digital_segun_autores.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5ff59ec3a93b3.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/chemistry_balancing_chemical_equations_worksheet_answer_key_about_chemistrysf99d.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/why_is_my_sub_not_playing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6014ec756cd85.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/do_you_capitalize_presidential_election.pdfIn PDF document text
    • http://theandyhong.com/greggs_value_chain_analysis6y66w.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/niwaluwanegarafozigamagi.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/how_to_change_time_on_dsc_alarm_panel.pdfIn PDF document text
    • http://4kuhd.me/english_to_marathi_dictionary_appc1529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_602aaebc1015a.pdfIn PDF document text
    • http://balifruit.com/honda_2000_generator_partsy6mqx.pdfIn PDF document text
    • http://knitfqph.site/manekikyyiyf.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/kujirazuwudekeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 4936 bytes
SHA-256: 9dca98a9f3b2e5c9434680fb88065016fdc6c4623224ddea9da6142841fbdb60
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10560 bytes
SHA-256: 1ea4963f97c3813fc862f690b70775f6044a83d260266f8bbb396c02de57093d

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