Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c135bd96dbe090…

MALICIOUS

PDF

75.4 KB Created: 2021-06-12 15:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 165c3539cf3f9d97761f57fcddc99ede SHA-1: 52fc3593d6e7a07d6aec8f0ea66c13c8be4aee40 SHA-256: 27c135bd96dbe0900b3b5f96e6e19bcaacee4cfb363a91123c23bf36958f7e71
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a critical heuristic firing for a mass external PDF link farm on disposable hosting. The primary URL points to a site that appears to be part of a phishing or SEO manipulation scheme.

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://chcial.ru/pbw?utm_term=what+temperature+is+vacation+mode+on+water+heater PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4382003/normal_60b55ddb1cf52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_600a8f94485a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373778/normal_5feb09f141c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_605d9e0af035d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_600c517a1900b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6010e40c45362.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/pobejar_susinuginawi_lizexelovu.pdfIn PDF document text
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/8837074.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/3dd98247-6213-4115-b7a6-eac6fad556cb/tobukizumukumefozewi.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144579513/95114717873.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/etapas_del_desarrollo_psicosexual_de_sigmund_freud.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/72841479818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdab9c0-4fc0-4837-ae8a-4ed845a29968/what_is_the_composition_of_photography.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/145107654/eso_western_skyrim_nchuthnkarst_location.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144976977/30778783315.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144592665/mevekekigutalelor.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5448 bytes
SHA-256: 361333fbd5090058637b296d5fc79ca3840aa7b57fc4d8c42bb2913d890e849b
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10920 bytes
SHA-256: 1cdf3bde3354a7930934a8485062b034ccac4d760d27c41abf39b245c178ac2c

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