Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2abfa79405d85c6…

MALICIOUS

PDF

73.8 KB Created: 2021-02-15 12:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3027afc71bf37dbf7d576f688e5a9dc2 SHA-1: 102eab0dbb75b5d5e50a5bba3d632bddd155e075 SHA-256: c2abfa79405d85c6d2d13885754bf62fe479a682fff3225acbad2ab0ad4ea4f2
126 Risk Score

Malware Insights

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

The PDF document contains obfuscated text related to a Whirlpool refrigerator, which is a common lure for phishing or malware delivery. It embeds external URIs, including one pointing to 'druttle.ru', likely serving as a redirector to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/123?utm_term=whirlpool+gold+refrigerator+side+by+side+not+making+ice PDF link annotation
    • http://xulikugo.iblogger.org/27291236327.pdfIn PDF document text
    • http://wofirulufe.iblogger.org/geometry_probability_worksheet_answer_key.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/radivofekeboti_gabozegixug.pdfIn PDF document text
    • http://ninavadilu.22web.org/mejoguwulerowanotez.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/c9338.pdfIn PDF document text
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/2742570.pdfIn PDF document text
    • http://gufutaca1.xyz/fawijezimg39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tomunipi.rf.gd/pofebaxotanitifivikuwizu.pdfIn PDF document text
    • http://tituroxir.rf.gd/38666904891.pdfIn PDF document text
    • http://butevagowug.epizy.com/gagusaloridikepesura.pdfIn PDF document text
    • http://nafovivejaza.epizy.com/rujiwezezop.pdfIn PDF document text
    • http://lukugebov.rf.gd/pdf_to_word_arabic_support_online.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/losuzodagadavisupolus.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/us_eia_weekly_natural_gas_storage_report.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/babies_dancing_videos.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5888 bytes
SHA-256: 2c34b9419fa6a6190e71fb6926ed211bab74c87a0272d4cd58f509c25ddcf92c
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10408 bytes
SHA-256: 0818a27261acbb8a391546b51de9c907e7c96aad4da3911b8ced7d5c35c26602

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