Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc9e73e6de5d69…

MALICIOUS

PDF

107.9 KB Created: 2021-02-28 14:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7650a32a80bc68469d082971870f6c8 SHA-1: 9ed11a8b7c74718496c9de3e06b93fd80a445efa SHA-256: 4dcc9e73e6de5d696257ba094f29db914988ed9769eda9416957284c56369c63
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-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.
  • 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://druttle.ru/123?utm_term=richard+iii+shakespeare+characters PDF link annotation
    • http://idealslim-italiaoficial.site/optiplex_9010_pricechrlj.pdfIn PDF document text
    • http://helpcopyright-service.com/leburizuzibofir4m8c.pdfIn PDF document text
    • http://qupieasy.online/lisosaparemefegt1h2o.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/jutobabe.pdfIn PDF document text
    • http://cosmicgig.com/things_not_seen_chapter_1_summarycpdz7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6020a17344d4a.pdfIn PDF document text
    • http://bitcoins-profits.com/rabbit_running_fast_around_room9igiy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5fecd5b282cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fd85330b1b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_6025844246ad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5fe75e99e6228.pdfIn PDF document text
    • http://nyvelsets.online/modelo_de_minuta_de_compraventa_con_poder_especial_ecuador13gfj.pdfIn PDF document text
    • http://select-get.top/67247612578vu4st.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/pedisol_tuloja_gobimirube_remexanosexovin.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/mutirexa/best_volume_control_app_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/likofezupuzijotegemafu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1E 5200 bytes
SHA-256: 545c058ef60bf57f5726b53adc490d1721272d648f85404dfbe97bb6e54492e3
font_01_sfnt_off00017bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BCD 11548 bytes
SHA-256: 73967b060f6593eaf7e0e5947a48c1b73f0ae7f36c247a42ed6275aba39e8523

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