Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b358f78283bd51…

MALICIOUS

PDF

79.0 KB Created: 2021-03-02 09:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17766bd269ca59d88d01256fa73e242c SHA-1: 519444166ee33de362aacc7585bff1c709427c21 SHA-256: 42b358f78283bd512c2bfd5716053c2748c9031cce7cb2034a93e411cb874efb
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 potentially harmful content.

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://vilenefex.ru/strik?utm_term=what+does+the+bible+say+about+god+loving+everyone PDF link annotation
    • https://cdn.sqhk.co/pasojixaju/PBgjagh/gas_price_5_year_history.pdfIn PDF document text
    • http://instahelpforbusiness.com/cocked_hat_crossword_answer42xst.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/e6GMPXK/junufurirasaguxutob.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/M4jhTJo/archery_set_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/iijjahd/encyclopedia_for_kids._net.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/iAhgrzS/69948588692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_602cda581083a.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/RicoUqg/buy_nostalgia_ultra_vinyl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fed9112616dd.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/zozudazedagof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_6016e49a64918.pdfIn PDF document text
    • http://you-bestshop.xyz/the_claiming_of_sleeping_beauty51fhk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471481/normal_5ff903a4b0186.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/davetara.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
    • http://domuromu.atwebpages.com/salikixapibif.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/4725479717.pdfIn PDF document text
    • http://xikabuw.epizy.com/30075756819.pdfIn PDF document text
    • http://xakifozosuj.epizy.com/images_of_fallen_angel_tattoos.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/spreadsheet_compare_2013_not_opening.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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5284 bytes
SHA-256: 26784590d0beaa41ac00a1795d43832610a7a9d7a7e64ef8ac4fc5ea7163f787
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 10584 bytes
SHA-256: 111d6473883e14f8ce5a56ab834a427d080a7549e5c9e962d18f144fbf5bfa1c
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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