Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99b4004a4ec1268…

MALICIOUS

PDF

77.5 KB Created: 2021-04-17 14:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3dc5429b4e6f4bb3a81d9f7a4f42a2b3 SHA-1: 5499e692bf6a6c2ab4cf98dfa5ff9f6476cd05d0 SHA-256: b99b4004a4ec12687222b54383b3bf264512c30c2140eaedb034bbec08c5f8ba
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 0.9995

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://vilenefex.ru/strik?utm_term=surfboard+sb6141+ip+address PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481400/normal_6008691b6aff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_5fd18d183a400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fc9279ac1021.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/76179882215.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/96976964014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fde0dbca8e22.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/frame_relay_packet_tracer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6056498eb5755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_605641b300c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6048d286367d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_153094b090064d048aabdd63202ef2f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ddbea8-4d06-4465-99f3-bd7160354939/pepewosugilu.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/kivajedupixevorava.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_770f36730a8c492bb7b797b5516d2cd0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c564d13-9c20-4557-ab0a-0ad45fa11827/casio_g-shock_green_camouflage_mens_watch_model_ga700cm-3a.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/pazubuwukebuxar.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_fbb41ae620fa49daa81364aa015267a9.pdf?index=trueIn PDF document text
    • http://vidilig.onlinewebshop.net/bogowuriw.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_fceb9f07ca4c4f4dbf2b17725831f4c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/67486612917.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/dawn_of_war_soulstorm_ultimate_apocalypse_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/flowers_for_algernon_vocabulary_quiz_answers.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_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 5540 bytes
SHA-256: d6116ebd5c9f4d64666b4ea68bfaa83c3623cbddfa5bc583062841fd6e9128bd
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10032 bytes
SHA-256: b5edb06a215e298f424a19d84541a8b416fa46c02cdd10ad6738393f64d28fba

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