Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dd475615975b29…

MALICIOUS

PDF

79.9 KB Created: 2021-03-25 00:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2789ab8fffd64318149d435f9511b875 SHA-1: f003d729bb667c40231480b62b152a239e6ee3fe SHA-256: 76dd475615975b2928c2638b3c5fc2e044204fd4b9bc3847ae27589af3ec40cf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=mount+everest+base+camp+travel+guide PDF link annotation
    • http://atomyimperial.ru/bamiwanewedivajuxawos17dbd.pdfIn PDF document text
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/getegeno.pdfIn PDF document text
    • http://idclick.cash/c_digital_signature_exampled7b23.pdfIn PDF document text
    • http://itsnat.space/451671042594nzd2.pdfIn PDF document text
    • http://world-wild-shop.com/calgary_barbell_16_week_program_spreadsheetv97si.pdfIn PDF document text
    • https://mitukuruzatag.weebly.com/uploads/1/3/5/3/135346955/rulufi.pdfIn PDF document text
    • http://the-glow.ru/what_is_chinatown_famous_form3sru.pdfIn PDF document text
    • http://vemasujananexu.22web.org/1766777057.pdfIn PDF document text
    • http://testvvd.xyz/49045215003vcxfg.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/2031156.pdfIn PDF document text
    • http://zupedaganivo.66ghz.com/chiefs_vs_patriots_predictions_bleacher_report.pdfIn PDF document text
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/5177188.pdfIn PDF document text
    • http://firstsecu-paypal.com/rakarezegebojupudijuvowwawdz.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/3678984.pdfIn PDF document text
    • http://qunit.space/446114821469ks8f.pdfIn PDF document text
    • https://bifetidenogu.weebly.com/uploads/1/3/1/3/131379340/narefagejuwa_fovobol_rapafibemaxoli_defed.pdfIn PDF document text
    • http://criticcxck.space/you_cant_compare_apples_to_orangesxe7f4.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/pakutopojevenupov.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://uploads.strikinglycdn.com/files/ba2e1678-0174-4f5b-81ef-64fa827c7d3a/argumentative_essay_topics_for_middle_schoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a89dd2b-a0ea-4b63-8c5f-52c6aad988f7/27988581640.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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 5480 bytes
SHA-256: e05d071a83b192f2c4ed13745959b13e5ba0e915c2cb0362bb75f8e3c9986219
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11252 bytes
SHA-256: 8b56ea0f43ab4b221132a96e7b2f0812c14ed6358243494ba192367b8044e3bc
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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