Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a901227a13954cf…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 22:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8372a1e3df08552f7124053e6e4a8bff SHA-1: 223a08dd587d73b282fa444b522177f6657bcd52 SHA-256: 5a901227a13954cffc8932ed6a7b2d1f70baa0732be524147c054be9701144cf
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' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bologen.ru/wix?keyword=ge+smartwater+filter+gwf+cartridge
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/2602143.pdf
    • https://jufikaparilo.weebly.com/uploads/1/3/4/5/134592165/furup.pdf
    • https://cdn-cms.f-static.net/uploads/4491451/normal_5fd1489b038ff.pdf
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/3961542.pdf
    • http://itravelgr.com/fotos_dos_corpos_do_voo_1907db49j.pdf
    • https://xugeragerowet.weebly.com/uploads/1/3/4/6/134641260/tomesoriwaxebovokan.pdf
    • https://numuladak.weebly.com/uploads/1/3/4/6/134613837/tevin.pdf
    • https://cdn-cms.f-static.net/uploads/4529977/normal_6033711ac5472.pdf
    • http://xbet1.fun/foundation_stage_maths_worksheetstr660.pdf
    • http://kmplitka.shop/wuvuratoweledawiwopimulj3la.pdf
    • http://qqkaxes.xyz/excel_link_sheets_in_workbookgk3yt.pdf
    • https://cdn-cms.f-static.net/uploads/4386621/normal_601ce0bcb3cdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_36b89a433aeb4f22b3e72c88e5eb09d9.pdf?index=true
    • http://xatudoxi.epizy.com/54224480398.pdf
    • https://s3.amazonaws.com/poresi/does_the_soul_have_feelings.pdf
    • https://s3.amazonaws.com/nafibanefexex/dusty_pink_fitted_cot_sheet.pdf
    • https://s3.amazonaws.com/satulibaren/worksheets_division_with_remainders.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_9799e1127fbe40389a6f82a3f662d87d.pdf?index=true
    • http://logururud.epizy.com/deguponujajazifiw.pdf
    • http://famosug.epizy.com/autoria_y_participacion_criminal.pdf
    • http://temitugefowe.epizy.com/shark_navigator_model_nv22l_26.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_cbadab03dd394e6fba86cbfc1524b3cb.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_99576b3ed7c0409c87acacdcf23d8c62.pdf?index=true
    • http://zeraginijumeje.epizy.com/gigumiporirefe.pdf
    • https://s3.amazonaws.com/wufujudisu/78428046201.pdf
    • https://s3.amazonaws.com/memexelu/50114992986.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_off0000e7e6.bin
23358ffa490eb27417333cc16414aadaacaa7d0c9877f49f5d564194ce6b41ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 5464 bytes
font_01_sfnt_off0000fa79.bin
fefcbc18c1ce9ef2f9cb5ed81d05b1de756365684131ad66667b31994b8e8235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11168 bytes

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