Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c7787afe2b3293…

MALICIOUS

PDF

95.0 KB Created: 2021-06-03 21:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b8311f905fa5ce7f271d79b708285a78 SHA-1: c964179b9f31c0790ad2cf2192becbe8d97af3ba SHA-256: f4c7787afe2b32930f742a35bbb0c662bd92880735bf3a9f3f506f970751f8f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('pelibifir.ru') flagged by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=paises+que+conforman+africa+del+sur PDF link annotation
    • https://zanolunib.weebly.com/uploads/1/3/4/6/134664537/4e1d24596ba7.pdfIn PDF document text
    • https://fenitejum.weebly.com/uploads/1/3/2/3/132302819/3c73faba9be6136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fcf1be-e21d-43ad-a938-ad013692261d/myers_briggs_career_test.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413340/ejercicios_resueltos_de_gases_ideales_fisicoquimica.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/tikagudenorijigadijuki.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/nova_escola_de_linguas_maputo_mozambique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6eb514b-ff28-4a71-b1d8-597d37f0ce6d/21291938963.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/5105292113.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/clash_royale_tweaked_ios_no_jailbreak.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/f/10441110441.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/davabasaxebegedefotaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0584049b-7e73-42b3-b8d3-4a2aff26eaf5/40106214273.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144415620/48180074782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a6d5d0-6789-46fd-9110-efd1fa4226e1/kabosak.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/47925387742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80dea12c-3e8d-4b3a-b9ce-5098dde50bbf/78930259143.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144516090/73127330314.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/automatic_transmission_troubleshooting.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/85206641680.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/nekagavenaka.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144437709/barefoot_investor_audiobook_mp3_free.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_off00013375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 5292 bytes
SHA-256: 0fcf7d378c29af796e811efc2127126996f4e27b536d5e6e033fb9165f38a458
font_01_sfnt_off0001455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455A 12796 bytes
SHA-256: dad42fb59023d071be81915e0850c49e09c5b8c1b2c96f2766818e721c8e236e

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