Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5fccc24a1dd81c…

MALICIOUS

PDF

73.8 KB Created: 2021-06-07 07:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1a8cec88d8b38321be7145438c3a184 SHA-1: 3155da46b6e1b13e16846ab63177680db77a2bc2 SHA-256: bf5fccc24a1dd81c4e698336d0977d408099a6b25240f6e79b710b60eb45b5e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

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://ketchas.ru/pbw?utm_term=similitudes+entre+la+administraci%25C3%25B3n+p%25C3%25BAblica+y+privada+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453117/normal_603272474686a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5ff20deda275b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5ff69933dc40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_60b86ce7827c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_602744cbadd1c.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/8ab344a3-5312-4580-b1b4-39df691e217e/lafovizeg.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144466599/crestcore_tenant_portal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49685155-ceb4-40a8-847b-33de0e210d55/samiroximazibizetubobu.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/gadojexuvolusizexobin.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144424623/11522464588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aae34cb-1c93-45fe-bc83-e48c251654f5/can_gamestop_fix_my_2ds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31ff08d-7695-4dbe-84aa-226ba3e72301/61281131437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d0dac6-3162-4a72-b5d6-e6a09d987489/craftsman_10_inch_miter_saw_unlock.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/learn_to_code_html_and_css_free_download.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/35884649764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb3439c-048c-40dd-880d-72afb31084c5/41106766189.pdfIn PDF document text
    • http://kunozulig.pbworks.com/w/file/fetch/144575907/coreldraw_x6_full_version_download.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/nfl_football_games_tonight_on_tv.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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 5960 bytes
SHA-256: 7a477332ff7a5508a553cd61c01530d7eac524933d05f2fb9a783884a7c35fd5
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 10824 bytes
SHA-256: d976388bf3d8c160380dde2067842e297b4d57fac4cebd4ccd0a64726f9fac70

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