Malicious PDF — malware analysis report

Static analysis result for SHA-256 349e39d08e695305…

MALICIOUS

PDF

67.0 KB Created: 2021-02-17 08:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 70dd0678ee2d70bf60c28972d048033f SHA-1: 4c45e8bdf5234c50a1c5d955249a02473490bb11 SHA-256: 349e39d08e695305265d7a31bbd27c88b39abca95724e125d0ac7b966df27e2e
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many of which point to disposable hosting and are designed to lead users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+factors+motivated+european+exploration In PDF document text
    • http://idealica-itufficiale.website/el_hombre_como_unidad_biopsicosociali7hqz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6022cf767cc8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fcb2e4722527.pdfIn PDF document text
    • http://clientesdkb.com/50449226820nkbje.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/gamav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd112e5d9388.pdfIn PDF document text
    • http://forsage.pw/brother_hl-_l2321d_laser_printer_driver0yj33.pdfIn PDF document text
    • http://pro-komp-master.website/mojenumifa1gxtf.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/bavenuvun_xekexubewonasug_nixobosog_ziwalumikirok.pdfIn PDF document text
    • http://byseles.xyz/the_maze_runner_android_game31efu.pdfIn PDF document text
    • http://teren.fun/prodigy_level_100_hack0q5p2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_60129b71a8216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_5fd72ec20020f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_60122a327c549.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/viwiteta.pdfIn PDF document text
    • https://dumugukof.weebly.com/uploads/1/3/4/6/134647937/928736.pdfIn PDF document text
    • http://tlgfree.xyz/wewirabolovaexvw6.pdfIn PDF document text
    • http://sushibara.net/ludo_king_play_online_pcq1ist.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fd08e2514899.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/garorowa/kigumijavis.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_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 5536 bytes
SHA-256: 29220da4f3d2192488a16b0b07f3e94e96b4629fd8d287c389167d845f818902
font_01_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10068 bytes
SHA-256: e87d6aca76415cca95f6824de7071824ebce18926738aea21a4fc9cf98a6f039

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