Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6c8921b705c8c1…

MALICIOUS

PDF

84.5 KB Created: 2021-03-31 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 39830c92cc2dc9fb9adfaf079a8c1ccd SHA-1: 9157fac2f07f69e7732cc3c38ce28de41ce88bdc SHA-256: bf6c8921b705c8c1bdf24aeaac6e5e98e56c80a0427627880fee69391ccdc8ff
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/award?keyword=teoria+presente+simple+ingles+pdf PDF link annotation
    • http://propovar.ru/javascript_tutorial_udemy_freeze4s4.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/ih4gjmY/kakebowajopimep.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jiRYXhE/53876448970.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/barreras_no_arancelarias.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/92725508829.pdfIn PDF document text
    • https://cdn.sqhk.co/zogugumo/gghjkje/creeping_terror_3ds_guide.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/nenidewojabufadizalun.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/ghg7gjI/kojajadepomazowixuzeda.pdfIn PDF document text
    • http://buybritishcat.com/4698216091v4yhp.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/midazifilomewivome.pdfIn PDF document text
    • http://dfds.in/mujer_que_sabe_latn_completowi1vg.pdfIn PDF document text
    • http://trujillostacoshop.com/dalasafirol7qgz.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/cQ2k5fb/77192092742.pdfIn PDF document text
    • http://plafond.xyz/15559651860agz9h.pdfIn PDF document text
    • http://stav-games.ru/aqua_logic_flooring9u8k6.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
    • https://s3.amazonaws.com/jewizopukuni/how_to_buddhist_meditate.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/baarishein_anuv_jain_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a04d5ec-21a1-46c1-af2f-b6e1fa8b4588/goodes_world_atlas_22nd_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/21339122449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292f2457-c596-4cd2-92ce-89206b999afb/fonoroguzirisupu.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/unity_3d_endless_runner_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852f40c2-4624-4e43-9f9b-0c5999eaa42f/dibs_in_search_of_self_virginia_axline.pdfIn PDF document text
    • http://tirigofov.atwebpages.com/28595136812.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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 5096 bytes
SHA-256: c106a0c6a332ff07e4bf0d6bc4dd2bf6517ca25671ba73e2b940c5fa7101528b
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 12848 bytes
SHA-256: c308c939138195d3128c74e32b565a248abb68bc6b84cd2c8113ef61784b9663
font_02_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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