Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d2fdd9919415e5…

MALICIOUS

PDF

78.5 KB Created: 2021-03-14 04:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 106df36a3d5ced2a7b05510d4b1e709b SHA-1: dc77c5dceb0e111cec7a43187e9c051406b4b7e1 SHA-256: c9d2fdd9919415e535948d69491af816c332a64148cbe2534840311abf1354e2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://yafferge.ru/award?keyword=autumn+leaves+trumpet+pdf+chet+baker'. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs strongly suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=autumn+leaves+trumpet+pdf+chet+baker In PDF document text
    • https://netigobulon.weebly.com/uploads/1/3/4/0/134096742/a43f350dde5d.pdfIn PDF document text
    • http://oneitshop.info/vidyasagar_songs_tamilloe6k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_6032b3da5403b.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/37730599559ij0ey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6013a3c599e94.pdfIn PDF document text
    • http://opensoda.pro/fawizupinipitema2xh1k.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/3127745.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/pojemapuba.pdfIn PDF document text
    • http://namedaun.fun/honeywell_th4110d1007_installation_manualycf3p.pdfIn PDF document text
    • https://bozexiwagufib.weebly.com/uploads/1/3/4/6/134695017/wusux-xanab-danabidewutor.pdfIn PDF document text
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/gojavivi.pdfIn PDF document text
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/bisojiwusafe.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/nawuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00901ca8-00dc-4fe1-a25c-de96cab8b045/what_is_periodontal_pocket_depth.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/faith_no_more_easy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/chief_architect_premier_x8.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/26529835101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ad21ac-5474-4f8d-bbe2-40c2d6cb3678/25795350838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6390f969-e374-431e-b9ab-92380429e819/kudiwexavaminuxokokakifup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdca0f24-e2ed-4446-a45d-2944134f88f5/how_to_activate_acrobat_pro_dc_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/vonorizujevaminaranepajo.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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5648 bytes
SHA-256: 2c52320ccca193d218cfb9d6c477f139a1b3911deff7819cb974fab8840b2891
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11152 bytes
SHA-256: b1d7e1d730e2c1a4272991ab1027df0203287d5b5bca36dc8b3391b406e7f0c7

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