Malicious PDF — malware analysis report

Static analysis result for SHA-256 1133492aee14c83c…

MALICIOUS

PDF

83.5 KB Created: 2021-03-22 00:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff90265d2f8ca8b1ad854a886acddbe SHA-1: 2925e6e945ecb5a5bf60164e5b577da9ef69cbe3 SHA-256: 1133492aee14c83ce4ab84569c76f9ef729c6a3e3ebed56c1def31ae4387fa42
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate a phishing or malicious document. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=a+word+that+starts+with+r+that+means+love
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fd674d04f827.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/bcc177d4.pdf
    • https://static.s123-cdn-static.com/uploads/4454054/normal_60084fe7e1854.pdf
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fce0eff647a3.pdf
    • https://cdn-cms.f-static.net/uploads/4374533/normal_603d2f8fef7ed.pdf
    • https://cdn.sqhk.co/zabitokepum/ge5gehe/top_score_writing_anchor_charts.pdf
    • https://cdn.sqhk.co/vanewano/1hbiEgi/xepufowu.pdf
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/lewufoji.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_604d1ef14506c.pdf
    • https://cdn.sqhk.co/benadujeju/ggqge1c/powuxokimavuw.pdf
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/vejidukajetew.pdf
    • https://cdn.sqhk.co/xusikeko/iifPibl/75303140481.pdf
    • https://cdn.sqhk.co/matajikiwov/ijbCOgh/47098514154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/resixexi/latest_afrobeat_instrumental.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_331e7f23136444e78cc95308312ab25f.pdf?index=true
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_eda1355ddb2e46f3a6c597ae5d959a85.pdf?index=true
    • https://s3.amazonaws.com/temujonuwu/76852425817.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_96d66dd9482742bc92189c057485daae.pdf?index=true
    • https://s3.amazonaws.com/jedadokuti/bloom_taxonomy_of_educational_objectives.pdf
    • https://s3.amazonaws.com/vedexajawo/benezette_elk_report.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_bf70bae77dcd4e12a104a6fb991cbc2a.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/mandated_reporter_training_quiz_answers_illinois.pdf
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_d8381769e68f46f3b6b094e24ba14206.pdf?index=true
    • 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_off000108bc.bin
e67b4d1c14dd76c6b6e19a583a4f927ec0bcf9a9f40ec6ddb3da81620486b0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 5204 bytes
font_01_sfnt_off00011a59.bin
8b514bd5edc52c7009030d17d37e0bc097e03ddd771328dd9f3e0ab05937aa24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 11120 bytes

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