Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba04761f7fc26405…

MALICIOUS

PDF

70.3 KB Created: 2021-01-27 10:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f624806e92ce92a1f4185c989f5e1060 SHA-1: c16a889f5471021bd5b1ac73a74434c2f852be81 SHA-256: ba04761f7fc2640551919dbf09796370c512f6bdd21aabe26a9723d8a352eaac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=the+sacrificial+egg+theme PDF link annotation
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/xinajepoweroto.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/bitutipapo_wasudefedenuvit_xilobotexazex_buvugusegonomu.pdfIn PDF document text
    • http://edapog.online/events_in_atlanta_ga_todayacgfh.pdfIn PDF document text
    • http://stavki-na-sport.site/medal_of_valor_3_ww2_apk5lt4z.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/jihgic0/free_unblocked_music_download_sites_at_school.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/6999909.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/jukoxisojow/difference_of_two_squares_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/attorney_general_kenya_s_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/didokajedoba.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/japan_car_auction_sheet_verification_free.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 5244 bytes
SHA-256: 80c44dbbda14aca6b83ab58817a4808c9c03d81f6c21b2a37165c2c8e8c1289d
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10156 bytes
SHA-256: 3d18117f78b1d37287c800956184e04342a9126285e3cfc990960b593b977c2a

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