Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bdac7e9fadd8b1…

MALICIOUS

PDF

64.8 KB Created: 2021-02-22 22:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1e84d770243bde2a66bb18c6cae83e3b SHA-1: d105a639edd1e476bd92a7ced36b730f2abd7648 SHA-256: 47bdac7e9fadd8b1eccde51a0659968a7630a5029a34cb3cc57554af991337f4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to external websites, identified as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of numerous links to disposable hosting and redirector infrastructure is a clear indicator of malicious activity.

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/wix?keyword=marios+adventure+2 In PDF document text
    • https://dufeduvu.weebly.com/uploads/1/3/4/4/134481569/xikotos-fuzip-negebigiwud-moxexokazi.pdfIn PDF document text
    • http://jigabidom.22web.org/21445662957.pdfIn PDF document text
    • http://icub.tech/epic_7_haste_guidet243p.pdfIn PDF document text
    • http://copyrightproblem.com/the_carnivore_diet_shawn_bakeronite.pdfIn PDF document text
    • http://mon-fortuneo.best/geekbench_4_ios1gan6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_60296118df6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_6022a4e1bd1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_602d8cfe29e8f.pdfIn PDF document text
    • http://reestr.site/xijepsgqk6.pdfIn PDF document text
    • http://study-english-04.space/descargar_apk_story_saver_for_whatsappgr8mm.pdfIn PDF document text
    • http://tekplafond.xyz/burning_wheel_creature_codexec49w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447915/normal_5fef44ed6e247.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/p90x_workout_chest_and_backqtsci.pdfIn PDF document text
    • http://businessoutsourcing.org/wugelujoxoxisenewukizehv1x9.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/wixamupelinere/psychological_trauma_assessment.pdfIn PDF document text
    • http://kafuxuf.epizy.com/34917405323.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_off0000c3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DC 4984 bytes
SHA-256: 92003be717961ce582f65df8a2c09af2a6b785e8f58869ea2d1ce745593df389
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 9856 bytes
SHA-256: f951721fdb47f3a78974c22585ec948a0a3e99520ed1b054d2d910367228df18

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