Malicious PDF — malware analysis report

Static analysis result for SHA-256 753cc8c74240889b…

MALICIOUS

PDF

84.5 KB Created: 2021-05-15 10:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae312298c89ee123605df718f9a9facc SHA-1: aa320047788767979ea49417125180e320ca3d2c SHA-256: 753cc8c74240889bfd39f7bfc24e19d958a45c96cfd8a0faabecca75e4c69019
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=lg+service+centre+fridge PDF link annotation
    • http://xakaderinetatu.mygamesonline.org/85590655711.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/37944123848.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/49702771151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_6050643c543c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_605a6f54780d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60179bd233298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454559/normal_5fe4e63db2774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_603f969d7ab2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilofudako.onlinewebshop.net/demedepageronaliwetoped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b99817e-4491-4293-8732-2a2f992edc51/68654151783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38af9fd3-746c-4197-82f5-647c33a0c84f/tcp_ip_model_layers.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/51234789295.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/amcharts_tooltip_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d985b499-2f86-4a03-a5f0-99d15747b33d/gokexenejasitonuvazatusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e0104c-a899-4c39-84c6-dfca7a674c24/67754625079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bdba4d-034c-41a9-9623-1c04e96d914f/54709374754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69b58e3-03db-451c-9dad-b5b090538917/what_color_were_romans.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/sewing_guide_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/luxotapixuwolatuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d040fc40-202b-4059-bec8-d60b1bf71444/linaporutujelebonib.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/towogibi.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/nukurazurofigipo.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/audit_report_format_for_company_in_liquidation.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/69743233182.pdfIn PDF document text
    • http://solezod.myartsonline.com/rumus_payback_period.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_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 4948 bytes
SHA-256: 46a1a8b85c858ebf1bb52acd33b25d039ba4e63d07e848a40ff941a603b5b9b3
font_01_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 10832 bytes
SHA-256: a5cb86271478e62b9e5051913f56e8500bb1246073fe2923d49e6bc6128f9488

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