Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c844d276a0302a5…

MALICIOUS

PDF

77.1 KB Created: 2021-06-15 10:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c111c49e8f1a52c17ae5b643f02e830 SHA-1: b7635c0a70e9894e0b5cfc9dd7e5b2569f891054 SHA-256: 6c844d276a0302a5db8ac3e171bc32c64450923d6affeef8930e9841c8db843d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to various PDF files, likely for SEO manipulation or to distribute further malware. The presence of multiple external links, including one to 'crewmak.ru', suggests an attempt to redirect users to potentially harmful content.

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://crewmak.ru/pbw?utm_term=dragon+ball+super+broly+english+cast PDF link annotation
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/3550335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409627/normal_60090c1a068f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5fdc10c92df9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_60c6bf524946b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5ffce022b6b23.pdfIn PDF document text
    • https://fenitejum.weebly.com/uploads/1/3/2/3/132302819/5649279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_60188753a0d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468551/normal_5ff87028f3e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_604d26d9020be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_602fdbf20c8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_60463401ee722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_603568eda8e8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivapisi.pbworks.com/f/new_gana_song_in_tamil.pdfIn PDF document text
    • http://fiwonotexo.pbworks.com/w/file/fetch/144705192/alai_payum_nenjile_album_song_download_masstamilan.pdfIn PDF document text
    • http://momabigada.pbworks.com/f/miraculous_ladybug_season_3_in_order.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/f/metarumotufuvapesopu.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144509835/76548229992.pdfIn PDF document text
    • http://woziralipu.pbworks.com/f/xidirisovizujitewudij.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/f/how_to_find_area_of_two_similar_triangles.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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 5436 bytes
SHA-256: ab42b7a4f486d9f6116d31801e490aecc4e8eedd16039021451ba73e8f51f158
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 11236 bytes
SHA-256: 86f13d45a004f24b048c3fd96065175cde0aeab07340e5994c04e1b3e99791ea

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