Malicious PDF — malware analysis report

Static analysis result for SHA-256 528b8de873e9ab64…

MALICIOUS

PDF

71.8 KB Created: 2021-02-21 09:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 528eb768ca80a8a98e0cb504853b9663 SHA-1: a668e221e9c3e6f4013210b39f905fff30e54238 SHA-256: 528b8de873e9ab64ca5ede033d6dfbfc8623d6a343a92770624f7009b4147a68
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/wix?keyword=vocabulary+builder+combined+vocabulary+reinforcement+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453332/normal_5fda72ba2159f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_6016b48241bfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409122/normal_5ff15dedf17a4.pdfIn PDF document text
    • http://voirly.xyz/how_to_get_through_the_storms_of_lifeko9uj.pdfIn PDF document text
    • https://vikumufum.weebly.com/uploads/1/3/1/3/131398575/9dc2fa7ca176cb.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/hiegjji/wurutixulofipefivovoxibu.pdfIn PDF document text
    • http://pycnidwzxc.info/40298129508kqwep.pdfIn PDF document text
    • http://freud.icu/227807714870vl71.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/kerazajemena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_600adf773ad94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fff5e35d2e70.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/xisakazelelinim/bingo_card_generator_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/manualidades_halloween_nios_3_aos.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/15641394635.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/movies_hd_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/nedodixutadibaluzupu.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/86534400275.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/12948575853.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/chick_corea_spain_sheet_music_piano.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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 5408 bytes
SHA-256: d29f8d6bf5adaae90138c4a822ed2717a49d80d18bc8c1029ff5661c18dc5ed7
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 9940 bytes
SHA-256: e50bc9efd6f140437e6d9905e4922c82f61716ed72d967f9ae4a77f4c605696a
font_02_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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