Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b26952db709b319…

MALICIOUS

PDF

80.0 KB Created: 2021-03-02 21:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33ec9bd68f57a135e70fff18648e9278 SHA-1: 4057a705b1481a57c4779c78fad870e7fcae3f08 SHA-256: 4b26952db709b319f3b34b0fbabe9e4d7d527005eb5aa560f347477d00ba44f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=zf+6+speed+manual+transmission+corvette PDF link annotation
    • http://kefoweloruzopos.22web.org/xupasifumiz.pdfIn PDF document text
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/2700657.pdfIn PDF document text
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/4478516.pdfIn PDF document text
    • http://setovewurepenu.22web.org/50549844390.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/9094985.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/47120039264.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/912692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javewexo.epizy.com/believer_tamil_lyrics.pdfIn PDF document text
    • http://wapudajikipidem.epizy.com/south_movie_480p_mkv.pdfIn PDF document text
    • http://luloxefisamo.rf.gd/every_single_piece_of_information_crossword_clue.pdfIn PDF document text
    • http://xusixuxoribixe.rf.gd/53744829181.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/sawewivogufabiweni.pdfIn PDF document text
    • http://zegaruso.rf.gd/38921738679.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/advantages_of_modern_technology_in_agriculture.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_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 5472 bytes
SHA-256: 34e692140bba75a889cd34b9d2d6dcc848ec7af3fdefbb18149bc67db8df7c74
font_01_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 10740 bytes
SHA-256: 704336e7e3d8727ff0dac5ba767ac0a8662699027fea0dfc2d24f7bb1bfce06d

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