Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95557aef4383eca…

MALICIOUS

PDF

103.6 KB Created: 2021-03-13 21:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce12d04b504e4404c070d6a3b4e5dfa SHA-1: ee6eeb38d89ceb2038e8dfa9fd02c7fcfc6cb4db SHA-256: f95557aef4383eca6109527de00ced9e3096febcbd3afe38a7a0964b66974c6b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm, directing users to various websites. One prominent URL, 'https://vilenefex.ru/wix?keyword=plazma+burst+1+unblocked+hacked', suggests a lure related to gaming or unblocked content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=plazma+burst+1+unblocked+hacked
    • http://rotiwopofeze.mywebcommunity.org/luther_95_theses.pdf
    • http://marketitaly.info/multererror_unexpected_field2xcnv.pdf
    • http://vojemodipu.sportsontheweb.net/fifojija.pdf
    • http://lyudi23.ru/name_something_people_consider_a_sna707uq.pdf
    • http://voyazh-shina.com/xetijofadumtli5.pdf
    • http://gprofights.ru/421807641233h6fd.pdf
    • http://rbqjkwklnd.xyz/reading_comprehension_practice_high_schoolut7hn.pdf
    • http://wikowezenitezo.medianewsonline.com/pdf_oxford_latin_dictionary.pdf
    • http://detonic-romania.website/hyper_aadi_skits_downloadxod44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_751e8c75b52e4ca88cb99419174073e7.pdf?index=true
    • https://s3.amazonaws.com/lazolu/42519824098.pdf
    • https://s3.amazonaws.com/mukut/connected_but_no_internet_android_fix.pdf
    • https://s3.amazonaws.com/sulasatevirexo/actualizacion_android_tv_sony_2019.pdf
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_84e8354ddee443f8bd275df8de12ebf6.pdf?index=true
    • https://s3.amazonaws.com/dapekufoxiraku/crib_sheet_meaning_in_english.pdf
    • https://s3.amazonaws.com/juliziwojatige/america_s_army_2._5_assist.pdf
    • http://nakarajibap.myartsonline.com/haier_mini_fridge_thermostat_settings.pdf
    • https://s3.amazonaws.com/jejulurowev/customer_feedback_templates_free.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ed766c4160df476f9cd7b2729af73e11.pdf?index=true
    • https://s3.amazonaws.com/tawosutosuxi/movojed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014859.bin
a04ce2aa78407c1a90abb49601ceba60a0920f5a1841361a8ee22bdf291311b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14859 5320 bytes
font_01_sfnt_off00015a42.bin
ae2531a5766481ec1e2d5ac1f0543ca7c58cf011058e37bd577293a170552ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A42 12488 bytes
font_02_sfnt_off00018339.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18339 4324 bytes

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