Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5862e28252f0e8…

MALICIOUS

PDF

80.1 KB Created: 2021-02-02 03:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ac7b6ed1bc13c3954f2e3c0f0ecc5a4 SHA-1: 4e0db0e5d56557db0327878872121ffaf8391037 SHA-256: ec5862e28252f0e8780e425fc9227681c3daa7d5c57731fc11892d85102a5cbf
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links on disposable hosting suggests a phishing or redirection attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=8+input+xor+gate+truth+table In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_60144d9121847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446263/normal_5fcd7a875de2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5ff7913662420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fe9b62684f4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486193/normal_60078c8e234f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fda55a571678.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/6923329.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/getizar/92753836545.pdfIn PDF document text
    • http://xasonivuk.epizy.com/bambukat_full_movie_hd_djpunjab.pdfIn PDF document text
    • http://xebowuruno.epizy.com/28544483067.pdfIn PDF document text
    • http://musarozopod.rf.gd/chrome_mac_os_x_10._6._8.pdfIn PDF document text
    • http://palomidifigur.epizy.com/gopiduzevi.pdfIn PDF document text
    • http://golokelu.rf.gd/98128376773.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/xodinaxijekiwenod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 5212 bytes
SHA-256: 2db9c6dbfd8f258ec27cb291883b8400ef9d6c7b90cffa38aec54d0cadc17db1
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 11144 bytes
SHA-256: b99f0f7ec3602bec25f59d2495607dba6fb93811e8cf49047b5d8521ffb17b75
font_02_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16540 bytes
SHA-256: 98ad5323510c9de1ac6e2e9b9889a233ff963a1f04839678676bed672159d568

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