Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c7bf98122825ae…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 15:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dc652ec93e79da7ecaa672b887bcfb3c SHA-1: 995df018731816d059baa9f2bcf4548741dd147f SHA-256: 98c7bf98122825aea58d171dc9acc037397685ee4a45c695b4496d5168ddec2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents, but one primary URL points to a suspicious domain. The ML classifier also strongly indicated maliciousness. The file likely serves as a lure to direct users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/award?keyword=negative+behavior+in+the+workplace+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ff5ab42594c4.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/jujug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_60289b71a4e60.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/a37ea6290dcfb.pdfIn PDF document text
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/836c69bddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5ff1154263ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_6051dd5c7d1d5.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/2faf45.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/24285300630.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/83ed8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/730d3ea0-52f9-40ea-acb4-dbfb5aa7d790/pedosogerowuluwip.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/45733333932.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/ace_admin_template_bootstrap_4.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/9570233530.pdfIn PDF document text
    • http://lowuguja.myartsonline.com/jewetunan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dcc1d1e-d3b0-4092-a05d-b933dca5173f/53374129316.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/xolowixovexifaro.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/english_speaking_practice_500_useful_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/christmas_percussion_ensemble_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708a0dd2-aa70-4491-a5fb-aa18d4aa54ee/jorugalutarogareremos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 5564 bytes
SHA-256: a67d8a4577ec6c6f073db2715534bdee8215bc0e11969ea7ec2c32a103401e03
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 10180 bytes
SHA-256: 8ee750a5d8ed3db59d4e65b19fd7851014f3249f493ff83142d3508d1aa26a2d

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