Malicious PDF — malware analysis report

Static analysis result for SHA-256 409f753fba29a8a9…

MALICIOUS

PDF

81.2 KB Created: 2021-04-30 11:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 886aa49de6f75ccb80c0cf2b2f969704 SHA-1: c276144ac2e362c8f4c5f5df2101efc864633903 SHA-256: 409f753fba29a8a9c1484bc0214597575c013531efcdd3332535b1826d4a52ea
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm structure suggest the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=bee+hive+plans+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401518/normal_606c86d0add6e.pdfIn PDF document text
    • http://senteber.site/blood_bowl_board_game_ruleshfqe8.pdfIn PDF document text
    • http://lngcliente.com/nusufozamaramagedqs202.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/dejusizolina.pdfIn PDF document text
    • http://xonigej.mypressonline.com/talewuvevalajara.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/girisarij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_6041efee123f3.pdfIn PDF document text
    • http://badgesverified.com/86240880422ij953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcc00f79fb75.pdfIn PDF document text
    • http://bahis-sikayet.com/8552515258sn2u7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_60461cde9bd4a.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/luletibobumijiloxinoberu.pdfIn PDF document text
    • http://fbcopyright-center.com/how_to_find_principal_stress_in_3dxntog.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/mezinubegibepetabexug.pdfIn PDF document text
    • http://blockhcain.host/what_is_kx_modifier_used_forl13u6.pdfIn PDF document text
    • http://lnstagramsupportlives.com/aprilaire_800_steam_installation8o70j.pdfIn PDF document text
    • http://balifruit.com/xejaruruwabipam6jf.pdfIn PDF document text
    • http://realnoe-obshenie.online/1742082677xsypo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386852/normal_6008a9594fee9.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/poresi/are_employees_required_to_wear_masks_in_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/apnea_del_sueo_tratamiento.pdfIn PDF document text
    • http://tepominofujemo.atwebpages.com/bim_360_docs_download.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_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 5100 bytes
SHA-256: f70fd584d36cf8da41f84e684644284678590a55673d1977240dfbcf2c657a15
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 11192 bytes
SHA-256: 8016b9c13798e82938eaf0e92a22dbc372eb36d09d86d86f0b08b47b129f7f53

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