Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0af7bca4ebc5e5…

MALICIOUS

PDF

79.4 KB Created: 2021-02-28 03:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 782bdf66fd238aa80def7e3baf0edb54 SHA-1: 79f564cea127c31d5215822fc9591ae7d9b8f3cb SHA-256: 9f0af7bca4ebc5e5d820515b5060b713aa32a46260d0ff69c63a34a845a7fe1a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=hayward+pool+heater+service+light'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/123?utm_term=hayward+pool+heater+service+light In PDF document text
    • https://cdn.sqhk.co/lovuzegonu/emgjg2k/woxosuzufokaperezetudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ff431a6ca7cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_6027365b2d060.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/bgdijjc/notes_sight_reading_trainer_review.pdfIn PDF document text
    • http://dunizajo.66ghz.com/73457700469.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/ibLQheV/93827194601.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/GigifjO/top_up_digicel.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/haANAgj/princess_and_the_frog_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5fe2308510ff7.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/kozibowisenatu/12888207451.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/nds_emulator_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/gta_sa_cheater_apk_for_android.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/windows_10_update_assistant_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/stickers_whatsapp_en.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 3312 bytes
SHA-256: 707f044220626673030db1e929683b7e6be6df4515348478205ae719871ec17a
font_01_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 5232 bytes
SHA-256: 05a9b44ae9a69f113fd24a0021fef5abac4bd09b706b33d2be260711480c500b
font_02_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 11388 bytes
SHA-256: 95550ce9df60a134422bfb18e393c3887e4b8e34e3238460f9bc08b145ded408
font_03_sfnt_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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