Malicious PDF — malware analysis report

Static analysis result for SHA-256 657339e0b68d0d2a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-19 17:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b848fba25b3e4258a21d425ad85c56d8 SHA-1: 1cfe025fc1afb6d4aafe8b630d4d184f08209906 SHA-256: 657339e0b68d0d2a82571a7fc20de17cf2c67e53245d59869e9bdcbbe201e854
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or scamming intent.

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://nipisod.ru/123?utm_term=java+jdk+8+api PDF link annotation
    • http://copyrightshelpcenter.com/vasadezigojerulemokuwa4v.pdfIn PDF document text
    • http://idealica-ituficiale.website/apache_hiveby22n.pdfIn PDF document text
    • http://jasovawuke.22web.org/padimuku.pdfIn PDF document text
    • http://litvinenko.xyz/ohio_common_core_standards_math_8th_grade_129bgy.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/4b7c5626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_604f7b3624f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_602593ca5a5fa.pdfIn PDF document text
    • http://titanof-filtr.ru/7645343308532wm3.pdfIn PDF document text
    • https://xisaxori.weebly.com/uploads/1/3/5/3/135324705/57d67.pdfIn PDF document text
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/6232559.pdfIn PDF document text
    • https://torosiwetub.weebly.com/uploads/1/3/5/3/135351177/1c390aa75156b.pdfIn PDF document text
    • http://firstreadersclub.com/77597358146hsefb.pdfIn PDF document text
    • http://letnesil.xyz/cristo_el_anarquistapkyf5.pdfIn PDF document text
    • http://reweder.site/jj_smith_green_smoothie_10_day_cleansebx2ex.pdfIn PDF document text
    • http://edaruzal.xyz/thematic_analysis_in_qualitative_research_dissertationqnoil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5fe35a8f2f036.pdfIn PDF document text
    • http://cheapestshop.xyz/musoxeludukesuwety56xx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topufopotu.epizy.com/gewiruko.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_bcf725aaad5a4a0bbdf0f0abab6064c1.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_616518ade85848a4ab8a187c6b69c69a.pdf?index=trueIn PDF document text
    • http://noxewun.rf.gd/vopavipole.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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 5028 bytes
SHA-256: 8ae8f9507d9cb9c60d3d3758081788333596aa7b493f546d358518c568115698
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11572 bytes
SHA-256: b4f2cb6c8414e5df86cd4c44a4c40b2aa39f95e97093eca26dbaccf27ba14b4b

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