Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4c7521b3ccdd16…

MALICIOUS

PDF

73.5 KB Created: 2021-02-15 14:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 57efb230b5dad36eb390ea82c011d52a SHA-1: 48421f2b76cf11afe6edd76fddc7e9b978f1854a SHA-256: da4c7521b3ccdd16b5705d07f125716a064c7aba69860900a20c5ca45d4ecfd0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://jottigo.ru/strik?utm_term=oracle+sql+convert+date+formats PDF link annotation
    • http://helpverifybadges.com/arizona_martin_luther_king_dayduoad.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/Yhhgeio/teacher_apps_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/XcjftZE/jivadufuzakaw.pdfIn PDF document text
    • http://hotsales-com.xyz/19436830785alg9s.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/9aQohdf/30836005088.pdfIn PDF document text
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/wagob.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/igcs4Uj/loriluvi.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/fLhigge/best_heroes_afk_arena_2020.pdfIn PDF document text
    • http://ubzvp.com/2004934384510b8d.pdfIn PDF document text
    • http://ostanni.fun/86795394733nh6m6.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/gcggiFe/fujawolix.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/monabinap.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/diwori_luwamagebope.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/8523193.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/wivunonovef/serena_and_lily_moses_basket_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/81020276739.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/litajobadirowa.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/uniformes_de_futbol_atlanta_ga.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/maxanimekof.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/7776636874.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_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 5380 bytes
SHA-256: cdb02a4326297af1eb4353f08e36de4e755058dcef4ea3d2c1f68b026e0e1ac5
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 11008 bytes
SHA-256: 244db7243d565c135283049bec692d863634b4e7982cd23e6aac78cd3879189f

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