Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b60bafdf060dfe…

MALICIOUS

PDF

76.6 KB Created: 2021-02-08 17:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf0623c5d398edaca44c3863df51add6 SHA-1: 9eca325be43b4c67677a4ce0bea3b0af8ef14611 SHA-256: 25b60bafdf060dfe397cdc91054bbec21f5c1dcee6ce6e2d53f184637df88ef4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

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://leonvi.ru/123?utm_term=argos+receipt+transaction+number PDF link annotation
    • https://cdn.sqhk.co/duzemata/WsPZ9hi/radio_rock_and_pop_online_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/jjjjCHH/rudadozuto.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/yBiOhd9/kibov.pdfIn PDF document text
    • http://freds.space/74817235112eqxm0.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/awUUbYy/dadajufikefubolijodivo.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/gi6ijBb/pink_and_yellow_ombre_nails_coffin.pdfIn PDF document text
    • http://verifybadgesbusiness.com/chemical_reactions_balancing_equations_worksheet_answerswl597.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/idihhiY/recargas_rapidas_telcel.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/Qhijdie/zuweruvubinorowetap.pdfIn PDF document text
    • http://kmplitka.shop/denelobigavigobjxzi.pdfIn PDF document text
    • http://gamedv.design/burrhus_frederic_skinner_libros8dabi.pdfIn PDF document text
    • http://copyright-securityx.com/zizotolajifarhk19.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/cjciegc/iready_romance_fiction_and_novels.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/waduzirader/fiwaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/67503117572.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/54724501834.pdfIn PDF document text
    • http://dekuroveki.rf.gd/baghban_full_movie_hd_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/54233516361.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/kutimufisobogod.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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 5232 bytes
SHA-256: c8efac68b9d7a07755978735f7225d07d1277bb347e572226c83f6a7b8be4c5a
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10672 bytes
SHA-256: 9519a50f99386db441cc856434ffadee05a3eb4263c1c46873316db7f43ed03f
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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