Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5a51562fbcedf…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 16:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff2c89283205b942928cb439e72981ee SHA-1: bcb4ec165c5b01916784e39d206a7a516fce77a2 SHA-256: f1c5a51562fbcedf100111061e23b0d336842519a6295c5367a85b3e3fbd4398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or link farm attack. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which are unknown or suspicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a deliberate attempt to create a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9ad0q4u0dfta7uv953juskle9g/ravogoxobitane.pdf In PDF document text
    • http://fatename.com/uploads/files/202109081605257040.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/tadojedakizi.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210907161534.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/26836321302.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/79445250325.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/mejajudugo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/varegotenudifo.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_d4e1c.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/42386674570.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/39156496349.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/40389214746.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135d73dd7171---14886395892.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/98210558956.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/89421858682.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/80357161988.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/54474702353.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/luzogajefalanerojejojug.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jirade.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/sapitomafo.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/jakigenax.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/kilifumebaxa.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/26889541072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chrome+play+storePDF link annotation
    • 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://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_off0000ba4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 16716 bytes
SHA-256: 5d7c03ddf5f733550bdde08cc94ddbbf34b5c32efbabc4eecc8819d9f9c860d3
font_02_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 10468 bytes
SHA-256: a554bdfb10a4c7e8f8ed9c25f7dcb78536c032f6fe4a8740c96729a1d6853c72

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