Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccf282b7d1c76fa…

MALICIOUS

PDF

71.4 KB Created: 2021-03-03 09:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c91de8e61dcf674605218328cdadf5a1 SHA-1: b1e01e7385631cf9bd9ff7f8d6979a329a76c927 SHA-256: 1ccf282b7d1c76fa2b1b1617a11c315be2cf0ed16c1bd771f28219ac57a82f53
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to drive traffic to other sites. The embedded URLs, such as 'https://vilenefex.ru/wix?keyword=plural+y+singular+en+ingles+reglas', are likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=plural+y+singular+en+ingles+reglas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459188/normal_601fd520260f8.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/farufadexudedodemuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fff485ab7a63.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/the_crystal_bible_judy_hall_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_601d9f65c0878.pdfIn PDF document text
    • http://lady-bug.club/brooklyn_comic_book_store0cej9.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/6831764.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/ruxifilagivunule.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/86743362800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefarobi.rf.gd/jakapamupigupepiguwalop.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/how_many_calories_are_in_a_jersey_mikes_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/anger_management_log_worksheet.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/davimadefokuwuti.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/enamorate_de_ti_walter_riso_wikipedia.pdfIn PDF document text
    • http://xudadadof.epizy.com/bupitabiwazogopevodatow.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/la_biblia_latinoamericana_online_gratis.pdfIn PDF document text
    • http://pigosegekezejol.epizy.com/53760447660.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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 4956 bytes
SHA-256: 2005c8a6fdc1f3df1814f49b636d27df170a61e5d896684268d21ea933a42406
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 11320 bytes
SHA-256: 827754b1a362963f142dc3d3ffa2124e3fe335ee735a5db44d689f54982822d9

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