Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15701d47118cf89…

MALICIOUS

PDF

75.1 KB Created: 2021-02-27 13:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 733428b59f1d3a1a9035a544407b6e0b SHA-1: eec90c7d88266105bf3e948e3c57b5ed573a1e93 SHA-256: c15701d47118cf896929e12d36b2acbcef394ceda9a995d93985975f3a1ae4ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content, masquerading as a free download. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=one+minute+salesperson+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc5c98058dcd.pdfIn PDF document text
    • http://unlockdeals.shop/libro_el_alquimista_resumenxwf21.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/nitudekeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_60273ca2d5656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5ffefa8be49e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_602110015337e.pdfIn PDF document text
    • http://robot3.site/munowikoxifupuvtwy8.pdfIn PDF document text
    • http://zarabatyivat.ru/11848703044lrnde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60260e767f94e.pdfIn PDF document text
    • http://uspeh.icu/73503686840b6sgb.pdfIn PDF document text
    • http://karaulovlife.site/norton_antivirus_free_cnetanubk.pdfIn PDF document text
    • http://girlsbeach.space/trader_vic_s_bartender_s_guide_1947srhyr.pdfIn PDF document text
    • http://opit.space/burnley_squad_formationjono9.pdfIn PDF document text
    • http://zumbayuliya.online/78098970465ndt8o.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://s3.amazonaws.com/limepusotanal/25869052344.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/46192041446.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/pijikexoxusawepuxe.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 5188 bytes
SHA-256: 9550467d42a08b0a2062d6b2316cf7014ec34e86a0d4cb9f3602bfecfc2cdd09
font_01_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 10400 bytes
SHA-256: f5496725d7b2303395dcc719defc9cf98036e208e573e7e15c61a03d784741dd
font_02_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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