Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7efa6255a03c213…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 02:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffc9125b585f4136298b4698b20c30c SHA-1: 999076cfd3428868ef3787d46e83a67771fe9c78 SHA-256: e7efa6255a03c21337242278e038f77138316aabfc6fc5ec8b532745b4b2f5f5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site that appears to be a search result for song lyrics. This suggests a lure to a malicious website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URIs point towards a link-farming or redirection attack.

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-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://kuzutuzo.ru/wix?keyword=mirror+lil+wayne+lyrics+traduction+fran%25C3%25A7ais
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6024c4a243992.pdf
    • http://load-bcp.com/566843606758n37m.pdf
    • http://clebohets.xyz/english_bible_verses_app_free_downloadeb34h.pdf
    • http://sy0n.icu/3586285323kcqn8.pdf
    • http://twirlini.com/climatronic_golf_5_manualkwi70.pdf
    • http://unonatur.space/18369629361uzwgh.pdf
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fea318faf3c1.pdf
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5ffea435000dd.pdf
    • http://epaytds.xyz/regular_polygons_worksheet49ivi.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_602f3910e76ea.pdf
    • http://cmbmarketing.agency/mod_dragon_mania_unlimited_gemsdfrmx.pdf
    • http://3gusevshop.space/formato_de_nomina_en_blanco_para_rellenar_excel_mexicopttki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_fb516d868c70474dbfaa5aa6898d1062.pdf?index=true
    • https://s3.amazonaws.com/zurovajij/mudotexemuzirem.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_a07f83e459ec4d41a6fb476a2f3a5df9.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_5583e72a35d14ebaa5a19fe5782d5498.pdf?index=true
    • https://s3.amazonaws.com/vavejijitatofu/rozonebapulogopogopuwoma.pdf
    • https://s3.amazonaws.com/supefujoxopubu/ready_made_graphic_design_templates.pdf
    • https://s3.amazonaws.com/gafedupeba/hampton_bay_ceiling_fan_glass_globe_replacement.pdf
    • https://s3.amazonaws.com/kufazete/ielts_listening_exam_with_answers.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_off0000e74f.bin
9a5c4bac411ad28a280446f931cc76b317fb518cf74c22646671f4d080e18fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5276 bytes
font_01_sfnt_off0000f91a.bin
965ccf80381a08f4d32c284e755283dff4d79cb06cba161b3d8283ebc8a75282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 11644 bytes
font_02_sfnt_off00011e65.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 4324 bytes

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