Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b17ba4c9297f3d…

MALICIOUS

PDF

68.3 KB Created: 2021-02-20 01:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 78181f6430571e34d719b3ffb39b2778 SHA-1: a60c0363c07f675c910cc413a7751f3809e89bca SHA-256: 81b17ba4c9297f3dbdaf9da3069c9eeaff70bf4f4645c822464f79a3ac4dac2b
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=doubles+minus+one+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fe2e3e4b3560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_6007efafa078f.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/igNijgh/58345449349.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/gieAhc5/durak_online_gold_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_603036d1f2308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_60286689d3c8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_6004f4dc29d08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5feefa6795699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdfb155b93e5.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/ehbjeia/mejizoxeturadisoxilifuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_5fdad352e0c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5fd9d286c0f65.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/fgimEgj/city_block_health_worcester_ma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5fdf32462f85e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_6013bc8592851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_5fd815ea00b2e.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/tosego/formule_du_carbonate_de_soude.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/brainstorm_ideas_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bajojapemas.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/angamaly_diaries_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/14019754793.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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 5012 bytes
SHA-256: b80c74ebb39451fe15bc8107b23de44b82f3167452be5b5d72b825096437bf12
font_01_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 10192 bytes
SHA-256: c65c0b9e137e3d067f872d93f9e9856beb01a8d6809f1a4edba6b650d074ffcf

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