Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ec166188602545…

MALICIOUS

PDF

77.8 KB Created: 2020-11-11 02:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3c965b98d5457e8e43dca24bc8fc28be SHA-1: f402a44520dd5d517bf3502864e227280c85617c SHA-256: 53ec1661886025455325e3bb73b173f25dba29dd067d6072f31e9be98689fb73
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL is likely intended to lead the user to a malicious site, disguised as information about volleyball court dimensions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?keyword=medidas+de+una+cancha+de+voleibol+informacion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f8df9990dfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fab177185eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f8ac7d38fdb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/jorinelugowabe.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/gilimamezoxezas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b9f80a-1038-4b65-a8e7-16020f461492/xafejugolubupoturem.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/sezunolesopukibuti.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/70651942741.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/kanozanidodubukigenidus.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/123.hp.com_laserjet_for_mac.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 5268 bytes
SHA-256: b4f631be77900d46c8ef0bd5cba9d834fcc5dc5e343cee6f115dc07f44f58520
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 2548 bytes
SHA-256: f17d6b56fd8e78bc478b68c698a3110284aa3e31b57c9b967fcbad1a223eaed1
font_02_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 11284 bytes
SHA-256: a3dbb81d0ea3ad3fce74433806d3dbc86b62e01d6bea4ff2d5571e84f3cfc6ee
font_03_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36
font_04_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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