Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b37b2be18c587c…

MALICIOUS

PDF

71.8 KB Created: 2021-02-28 06:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 309bc71dda9168918f60c14c82d53126 SHA-1: 5955d7ba2c116ca3be10525f738d5f82cb7cde63 SHA-256: 04b37b2be18c587cb098aadd9520fad7c667346be6c91fe27e20ab5209d4fbfb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to printer usage, suggesting a lure to disguise malicious links. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=how+to+use+hp+officejet+4500+wireless PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fcdc862206fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/hjeidgh/fuxikujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_601dca793b785.pdfIn PDF document text
    • https://cdn.sqhk.co/gasosivifug/jibKif8/aliens_wallpapers_hd_collection_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_6015e7839b47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_601d2a986deab.pdfIn PDF document text
    • http://nawabopebi.iblogger.org/39594072931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5ff24e4c7a9e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/D3ge5bT/38819027391.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/BjdBFz6/columbus_blue_jackets_live_radio_broadcast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dovadef.epizy.com/95857810995.pdfIn PDF document text
    • http://bamalupit.rf.gd/16211081814.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/our_god_ultimate_guitar_chords.pdfIn PDF document text
    • http://girofili.myartsonline.com/how_to_configure_netgear_wgr614_wifi_router.pdfIn PDF document text
    • http://rodiwube.epizy.com/popumurexelu.pdfIn PDF document text
    • http://junopufobapepax.rf.gd/lavovikirodekifin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 5152 bytes
SHA-256: d2d2f0499f79e77901491680f5d22dc82226c7f06f9fcf584627fcc4fd033e71
font_01_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 10016 bytes
SHA-256: fa21dbbd47bcd557cdd910c790674ccdcac1f8bc86d6654ceadac341c81c52cc
font_02_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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