Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21aa530c9a18f5a…

MALICIOUS

PDF

71.4 KB Created: 2021-02-27 17:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a218e6c5e0560461f67ce4bdd2cd419 SHA-1: 7639170688f2ea42b89b3c9509e6bdcc1c0bdbc3 SHA-256: f21aa530c9a18f5ae26fb0b3523566a61c84773889f8c0da23994dd0149b497a
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, 'ponafet.ru'. This domain is likely used to host a phishing page or a second-stage malware payload. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=simple+compound+and+complex+sentences+worksheet+grade+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446924/normal_5fd7714ca1fdc.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/50336946084.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
    • https://s3.amazonaws.com/votubukaxogilix/bangla_movie_audio_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/dir-615_firmware_dd-wrt.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/vector_brochures_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/98477659617.pdfIn PDF document text
    • http://maxafatuvapare.rf.gd/smokey_and_the_bandit_2_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/69420942071.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/baji_band_song_mp3_download_jayasrilanka.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/manual_de_adestramento_de_ces_gratis.pdfIn PDF document text
    • http://posijibanif.epizy.com/best_ipad_app_annotation.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/sateg.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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 5820 bytes
SHA-256: ff36db7efdf32b2b6ca21ff1851aa78e67548e85dcb5436cb54fcd5ba02ea53f
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10436 bytes
SHA-256: 0bd1a99724dc98598a0c31a2b56df810ee91248f8af41cf981b632ae252d3aed
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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