Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64c8fcba780559a…

MALICIOUS

PDF

74.7 KB Created: 2020-12-03 09:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f39f88be9338ba5c7e16e06fe5b96fa9 SHA-1: 1d81fb12a538df7ad6bdab66dcd3db51abba51e6 SHA-256: a64c8fcba780559a1bdd8d13eeffe0c11be2230904238abcb7463dd2bebcf337
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation. The primary attack pattern involves a link farm designed to redirect users to potentially harmful content, as evidenced by the numerous embedded URLs, one of which is a known malicious redirector. No scripts were extracted from this sample, but the presence of many external links suggests an attempt to lead the user to a compromised or malicious site.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/wb?keyword=bimanual%20palpation%20technique In PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/a21786ea4c.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.pdfIn PDF document text
    • https://kadefetu.weebly.com/uploads/1/3/4/4/134471860/susunisubozixaw-senoluzidi-jokowi-duvalaloben.pdfIn PDF document text
    • https://kizutinapetesod.weebly.com/uploads/1/3/4/4/134490845/nirin.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/wevekixonufan.pdfIn PDF document text
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/bd82e5936f1.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/fejififimaketo/champignon_medium_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/spring_resttemplate_hostnameverifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64176a11-f90e-46b9-8933-01c6af21171e/what_does_archive_mean_in_email_account.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/throwing_weapons_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/62817388968.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 4956 bytes
SHA-256: 5ec09a3bb21c620435f96669446444d043aba4c79fbcfe86580bcc558f3483d4
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10520 bytes
SHA-256: ac146e1869bf1bc937e045920e3cdc03b82293891511a66c93df93627dc1ffa4
font_02_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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