Malicious PDF — malware analysis report

Static analysis result for SHA-256 752716035741e4f2…

MALICIOUS

PDF

69.2 KB Created: 2021-02-24 15:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 430f8bd738e5971ddcdaf9d67cecbb0b SHA-1: 798fffcfd7a83fd97bbc7f13a9e10a563a8c940c SHA-256: 752716035741e4f2a1312f80682d21d3e37a74ac116cb501f02c30ba479cea70
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack, likely leveraging embedded JavaScript for obfuscation or redirection.

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://druttle.ru/award?keyword=how+to+turn+off+a+hardwired+smoke+detector PDF link annotation
    • http://xuwuvewisin.mypressonline.com/65147667065.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/46734532110.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/marlin_60_scope_mount_size.pdfIn PDF document text
    • http://letuxegesilem.iblogger.org/16554526814.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/does_the_lexus_hybrid_require_premium_gas.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/ihIjhje/zombix_online_mod_menu.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/how_much_can_a_pallet_jack_lift.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/gcD3zhd/695555405.pdfIn PDF document text
    • http://wegasanapifare.iblogger.org/3848401558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/book_review_format_apa.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/58862182087.pdfIn PDF document text
    • http://jilutuve.rf.gd/nugurobojupamoj.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/haier_mini_refrigerator_settings.pdfIn PDF document text
    • http://nalokematu.rf.gd/6280870515.pdfIn PDF document text
    • http://susejukeb.epizy.com/4352873022.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 5348 bytes
SHA-256: e7cb021bc76e0508f4a2ce7b0a2801b2d14a54c49f63b5d559af2bbd9e96061d
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 10428 bytes
SHA-256: a3e5eb43b146216f88fd05b6dae670aaaa534089446f1d76409872df51752bcf

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