Malicious PDF — malware analysis report

Static analysis result for SHA-256 b208f2a4b840ecbd…

MALICIOUS

PDF

73.5 KB Created: 2020-11-17 07:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a32286c06e1c7c70f84858464d26033a SHA-1: d2f69ecb95c09bb5da79e159dcded45424cb50d3 SHA-256: b208f2a4b840ecbd9f0f8fdc220058d4227585ce66dff6049538deb7f1da1446
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links, one of which points to a known malicious redirector, suggests an attempt to lure users to malicious websites or engage in SEO manipulation. The document body is heavily obfuscated and unreadable.

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://ggtraff.ru/123?utm_term=ap+test+dates+2019+california In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5f99d8a255b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fa6b1b9e8373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fa514e7b2831.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/repal-pezobawug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_5faf023e30ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f98a0f589d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87321778c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_5fa51a505e566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5f8fcaa1b7dd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f9194d6710f6.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/fevubufami-girupekik-vuxusumogi-kelolagivitogup.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/zugutixe/24775299344.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 5620 bytes
SHA-256: b0f8a9684fb5029752a904aae9f0f48b4b83facf9c7d5f5c81ae8345cc9a5e0e
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 10284 bytes
SHA-256: 5bf80799771c4d830486c1bb7f9a727a2175b62e890c01a23f9c59a87ae3481b

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