Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d10838ebcd21f55…

MALICIOUS

PDF

79.7 KB Created: 2021-03-11 16:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fada76b813e4e0b5c0b6adf51e7a374e SHA-1: 111173a2fea8b7a41a9d65d8263767034a103504 SHA-256: 9d10838ebcd21f55dc0b22572552e2fbe75cda1afe3a1d4e67dc1a85bf71ecb7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=casio+g+shock+watch+instructions PDF link annotation
    • http://getsol.xyz/dokunijolevidigurumoxcsa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_600e4615e61dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fee00ddd8010.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/bibofesusorug.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/19374.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/1478509.pdfIn PDF document text
    • http://nature-ital.space/zijasozaduvulokilivomeswvcu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_5fddd8aa22da6.pdfIn PDF document text
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/6c33b2ae6.pdfIn PDF document text
    • http://sun-italy.space/australian_catholic_super_withdrawal_formhz0n1.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/widomepamup.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/dilasobinanesasenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60163a164c114.pdfIn PDF document text
    • http://vekvelo.ru/download_domino_gaple_offline_mod_apko19jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_6013ba24aeffe.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/warasedujuxirevivut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/how_to_write_a_thesis_for_a_film_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/wupiwokorulolezomogef.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/how_do_i_install_zotero_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/dabodobulamuxebarogow.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/veg_recipes_of_india_kadala_curry.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_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 5088 bytes
SHA-256: ef3fe65dfb8937737b314bd3bdda7330957f82cd40fedf17680b06fb6581daae
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 10556 bytes
SHA-256: efafb36049164cd24b40286eab63076eb395699da06f02d08bc172b6e4d1a130

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