Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e21bc2f38a41cdf…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 06:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b251f08654ca34730b4e8b86d12fb7 SHA-1: 22d6a7b410503776172ddca7ea3c5cbbe92d9122 SHA-256: 7e21bc2f38a41cdff162e3e126fc9f89c9439061172da1fd76f813b064cda1da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or SEO spam campaign.

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-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://kuzutuzo.ru/wix?keyword=pre+op+assessment+questions
    • https://cdn-cms.f-static.net/uploads/4476420/normal_5fe90530d4b35.pdf
    • https://cdn-cms.f-static.net/uploads/4475217/normal_5fda4394b94c2.pdf
    • https://cdn-cms.f-static.net/uploads/4444378/normal_6023c4c1226e4.pdf
    • https://cdn-cms.f-static.net/uploads/4443802/normal_603c24c3921b0.pdf
    • https://cdn-cms.f-static.net/uploads/4428069/normal_601d0d88e77b9.pdf
    • https://cdn-cms.f-static.net/uploads/4414873/normal_603c5950b5c21.pdf
    • http://fiduvizowema.iblogger.org/21259399889.pdf
    • https://cdn-cms.f-static.net/uploads/4447253/normal_601977c023f67.pdf
    • https://cdn-cms.f-static.net/uploads/4383579/normal_6032859be1ac1.pdf
    • http://xukuvapama.iblogger.org/art_of_seduction_book_amazon.pdf
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5ff7d420a09b4.pdf
    • https://cdn-cms.f-static.net/uploads/4415930/normal_6028fffe159bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sorapobuk/kill_devil_hills_surf_report.pdf
    • http://tijuvewoduga.onlinewebshop.net/catalogue_electrique_schneider.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_2a7a1065b2074d9387d92edec6742566.pdf?index=true
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_f9339e5a22444d2984826835a1bbceec.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_78ed5c7886df4da4ad626eba91df289e.pdf?index=true
    • http://deketinak.rf.gd/light_my_fire_guitar_solo_sheet_music.pdf
    • https://s3.amazonaws.com/mupukesunobaga/fawupeziwuzuwutaxumoweji.pdf
    • http://vubuzixefixa.onlinewebshop.net/longman_dictionary_full.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_e9532f541f48490db09ab694be5c4b2f.pdf?index=true
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_b677102b914e47a898b801bd56bcdd0f.pdf?index=true
    • http://gufaxepelirub.rf.gd/batman_the_dark_knight_rises_apk_mod.pdf
    • http://zenujasope.epizy.com/zizanolibofakepi.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_off0000f92f.bin
af3955cee8dd14ea34ffcc9809cbca8b0f0bad53665d6ead174636e4478849fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 5060 bytes
font_01_sfnt_off00010a4d.bin
b3e5b3bdf73228d470879d413970eca6a2b84bdfd9b6fb12fd276245bd1f25a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 11084 bytes

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