Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09004298d09b372…

MALICIOUS

PDF

108.0 KB Created: 2021-02-02 14:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4aaf1a4f5efa75480e6d6b67d803c7c1 SHA-1: e345c06167914e7d7a4908e6ab597119eba06037 SHA-256: f09004298d09b372c0aa3d8984b94f0256af3c44c07feea6acd17587980c6980
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, indicative of a link farm or redirection scheme. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a weather report, serving as a lure to encourage users to interact with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=kotla+weather+report+today PDF link annotation
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/riliziwin.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/d36185a852.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/wirupivawa-kodilukowok-kovijivuvuwoz-pogovun.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/giegjig/vutizevowovoxudolatubes.pdfIn PDF document text
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/domizasudejuvawil.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/xelit-piwapo-ruliwatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugofabafomozo.epizy.com/virazile.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/adjectives_verbs_and_adverbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/68517723422.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/bjcp_guidelines_russian_imperial_stout.pdfIn PDF document text
    • http://juxenemijoguku.rf.gd/adm_pro_apk.pdfIn PDF document text
    • http://vigukesege.epizy.com/sefekowemivogugaxeni.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/burkert_fluid_control_systems.pdfIn PDF document text
    • http://jukiwifid.rf.gd/digiwovavekibe.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/china_english_font_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A5 5032 bytes
SHA-256: 8fe0afbc3ae1dc7ad6f024924046e982c625f954901e59cf0b4e03b113ba3897
font_01_sfnt_off000168d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D9 10684 bytes
SHA-256: c503fa8dd2263d5c5b5009253ea67cb20bc38015075df1a62020f9dc9d0afbe6
font_02_sfnt_off00018d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D70 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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