Malicious PDF — malware analysis report

Static analysis result for SHA-256 294e407993fb5e50…

MALICIOUS

PDF

68.0 KB Created: 2021-03-01 12:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c39aa0bf5bfc3a19c07024ca9591819 SHA-1: 75f1dc80422a49298bac7b4b78ef30e0773f739b SHA-256: 294e407993fb5e50944ee51c931f20501e337128a00a15889e46ce65bc66bb09
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or SEO spam purposes. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=10.1+geometry+answers+practice+b
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/wikuxepejuxisitutopu.pdf
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/sabepog_pegode.pdf
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/1989520.pdf
    • https://cdn-cms.f-static.net/uploads/4458616/normal_600d3b323c446.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/nozusi_loduralobuletes_lupomu.pdf
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/denulozojoduger.pdf
    • https://jipotawa.weebly.com/uploads/1/3/6/0/136097183/ludetade.pdf
    • http://sisaratu.iblogger.org/lowifewebet.pdf
    • https://cdn-cms.f-static.net/uploads/4500670/normal_601c630ab2f15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/supefujoxopubu/combine_excel_sheets_into_one_macro.pdf
    • https://s3.amazonaws.com/fovezewi/remington_1100_camo_pistol_grip_stock.pdf
    • https://s3.amazonaws.com/tixeligufokup/assassin_s_creed_unity_dead_kings_ps4.pdf
    • https://s3.amazonaws.com/nitidadufetenu/year_1_guided_reading_test.pdf
    • https://s3.amazonaws.com/jupudizadid/triangle_congruence_problems_with_answers.pdf
    • https://s3.amazonaws.com/liwara/refeno.pdf
    • https://s3.amazonaws.com/vuraradaso/tofinu.pdf
    • http://felubefetixiwu.rf.gd/4922016017.pdf
    • https://s3.amazonaws.com/jubiferekaka/zoxaribaba.pdf
    • https://s3.amazonaws.com/medaliwifufugel/wuzewokoji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc66.bin
358f40999c6ce9818863ea69d0c09259d96d3fd8b11545714a5c43b122c1af5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 5688 bytes
font_01_sfnt_off0000dfcc.bin
84ba5050dbf29d9cbfce96a9095b383ca90b53480df413d3e96eb77ff033c069
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 10312 bytes