Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b1722cd653cc13…

MALICIOUS

PDF

118.8 KB Created: 2021-02-22 21:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b50e1ec78daa9ec0553923affffa3ece SHA-1: 296a86131d7c385df1f91d8180d22a9560e0644a SHA-256: e4b1722cd653cc138bb00bea456445eab3e11b0400d9894d560af2816c564723
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 0.9998

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 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://jottigo.ru/strik?utm_term=letra+del+toque+de+bandera+e+himno+nacional+mexicano PDF link annotation
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/xitujuzizoxuxom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6028eb1d2267b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6013aea6b9178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_60316a367041b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubabin.rf.gd/periodic_table_worksheet_instructional_fair_chemistry_if8766.pdfIn PDF document text
    • http://gonurorirezode.epizy.com/discuss_both_views_essay_template.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/please_find_attached_the_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/deep_fitted_king_sheet_sets.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/19508974290.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/56074664742.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/american_billboard_2018_performances.pdfIn PDF document text
    • http://kipafiperugava.epizy.com/69108246450.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/77774533467.pdfIn PDF document text
    • http://dekutob.epizy.com/guide_sivir_lol.pdfIn PDF document text
    • http://zaponabugati.epizy.com/8204630653.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/huawei_y9_prime_2019_android_10_update.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_off00017df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF6 5276 bytes
SHA-256: 83a8b84549f22d70c76a993c1a014a4ac6920b7a4f75096443159ea83dff04c3
font_01_sfnt_off00018fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC0 12056 bytes
SHA-256: 35b1afadf1a0949f6833df14cac55bf5d05c19ba6b0100098b5a588c580e995f
font_02_sfnt_off0001b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B68A 16076 bytes
SHA-256: ae534ac88996215c963a78aeb32ed9384dc8ea50475975f029e54da0b9a05bfd

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