Malicious PDF — malware analysis report

Static analysis result for SHA-256 e647c2e282a114d5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 21:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f0a9a270171d6b01d5f056d7b900164 SHA-1: 67f8746da07d644c5d270076a22683ba96bb6e34 SHA-256: e647c2e282a114d53dd7368c819e7a974a711ad48892ecf03b11400146ba00ea
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The presence of ClamAV and ML heuristics flagging it as malicious, along with the embedded URLs, strongly suggests a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/aws?utm_term=betty+crocker+cooky+book+1963+pdf PDF link annotation
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/9f71de999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_604637b94c18e.pdfIn PDF document text
    • http://academic-club.ru/perepefajugisavurxzl45.pdfIn PDF document text
    • http://foyou.store/953161194519e3gz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcf7bfa7182f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5ff4976e137fd.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/fipopu.pdfIn PDF document text
    • http://the-english-temple.com/13895981805zqo5t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481825/normal_5ff1774ef08ce.pdfIn PDF document text
    • https://nuzokubipodopu.weebly.com/uploads/1/3/4/7/134732356/risodafu_figajekag_xaweka_wavuwibeloxaz.pdfIn PDF document text
    • http://chebsvet.ru/87098537711w0vc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388289/normal_5ffc79326bbb3.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/jidebomoxela_xumomowej_vekubabegidibup_dodoboxodewe.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/8069175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deroselewem.epizy.com/conversion_of_units_of_measurements_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/3980083499.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_94f81c501a56401abd506792f5a58d96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/39409927520.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/62434664585.pdfIn PDF document text
    • http://wulumesa.epizy.com/mandatory_reporting_qld_community_worker.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_bb82b2298e77464481fd1ab99d4f65da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/nutebazum.pdfIn PDF document text
    • http://kixukad.epizy.com/aimersoft_video_converter_full.pdfIn PDF document text
    • http://gigigij.rf.gd/espn_fantasy_cheat_sheets_ppr.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/deficiencia_de_vitaminas_hidrosolubles.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_c59e1421a61f4daa856bd4fab3d6af62.pdf?index=trueIn PDF document text
    • http://gojexigubobe.epizy.com/bowur.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_3122917757a14f5a8d3056598ee0df41.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_26c218345d1947779599f2e1a31fbf4c.pdf?index=trueIn 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_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5612 bytes
SHA-256: 2e18c94feabd5a0559085234589e9f404bd59328449529cc871da73d141fd635
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 11000 bytes
SHA-256: 791eb1104152b273b03f0e5c4f90e31a77031a8747d6d60279d88a8f0e39438d

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