Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fb7304e0382882…

MALICIOUS

PDF

76.1 KB Created: 2021-03-27 12:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4654cad7a9ce7e25da24dc88e9eefb5d SHA-1: bf6bc04b4d75fa6151e512f8a1af3f09fedd07f9 SHA-256: 81fb7304e0382882f50a615c8deb8084c00e146a27928961c59b4605fd3f7f1d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and link farming. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of embedded URLs and the heuristic firing for a 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=jewelry+appraisal+template+pdf
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/6510121.pdf
    • https://cdn-cms.f-static.net/uploads/4411700/normal_60160bbb3add9.pdf
    • http://prizyivnik.ru/bikefasad6r2qj.pdf
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/buzoxujirezodipodore.pdf
    • http://vosalax.22web.org/vozapidulunepaxixuw.pdf
    • https://cdn-cms.f-static.net/uploads/4489263/normal_60595bcba50fd.pdf
    • http://tgesheff.xyz/xudafomejej9vves.pdf
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/dilakuwamalovix.pdf
    • http://rerixen.scienceontheweb.net/how_often_should_i_change_the_oil_in_my_2012_toyota_camry.pdf
    • http://help-igcopyright.xyz/what_is_controllable_marginndmlk.pdf
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/02e59df.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/1967618.pdf
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/800188.pdf
    • http://opensoda.pro/advantages_and_disadvantages_of_capitalist_economy7odqa.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5ff2daab64938.pdf
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/6863463.pdf
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5fc70ffe93a35.pdf
    • http://sberbank.services/how_to_replace_harbor_breeze_light_switchegbyk.pdf
    • https://lumozumaxovoj.weebly.com/uploads/1/3/5/3/135348549/kizitexeregerex_vuzolut_xaler_reliniga.pdf
    • http://vajukadezazi.getenjoyment.net/legekuwig.pdf
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/5240150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vuwadiwotaja.rf.gd/11146852259.pdf
    • http://foretoxute.epizy.com/wimekopit.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_off0000e93b.bin
4d568050c210f24f0376711b55fbea96c777469ff83bc59d2fd2d54fa1834cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 5372 bytes
font_01_sfnt_off0000fb87.bin
6e1adaf6b6749a4b95d0f25b1a518d3727403188654ef8d0317baeb01c3cdae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 11240 bytes

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