Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6d9c737ab42d55…

MALICIOUS

PDF

77.0 KB Created: 2020-11-22 01:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 48e9de845ced231e88bcb2ea422a9591 SHA-1: ef178b51798e6306ae740a61c541d42e1b702468 SHA-256: de6d9c737ab42d55e46bf5496b2eafb240312424539d41d3e7fe9b1d5606adb8
214 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including a critical alert for a malicious redirector link and a link farm. The ML classifier also strongly flagged it. The embedded URLs suggest an attempt to redirect users to malicious or potentially unwanted content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/aws?utm_term=chama+chama+new+song++320kbps In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5f9860043d9c6.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/xefumobujujiwagariz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5fab6a4b37537.pdfIn PDF document text
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/df9113d7.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/wapabefizosumi/5972280589.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/aws_amplify_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/42122734598.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/xolos.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/artist_management_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/calendario_mundial_rusia_2018_para_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/aka_elephant_mask_khan_academy.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 5860 bytes
SHA-256: 2a308090ba7c5a5c704a257b9cdd0e078825d66b1d467437990e3fcfb509915e
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 2180 bytes
SHA-256: 75e7fb7974c4c7f653da33c1044ebe11651fae5020d27a9e64486c63ac14597d
font_02_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 11280 bytes
SHA-256: 54527a77b5e96adcd4886d8b26a8e8a85edb19805044602f26fd825d0168e74f
font_03_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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