Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4b570e0ebdc78c…

MALICIOUS

PDF

69.5 KB Created: 2020-12-20 17:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd566750219e2f0f9638d7cf8bedecd9 SHA-1: 1cf7b85c9a648fcf14e23460847540aa0af1429f SHA-256: 6c4b570e0ebdc78cf3653e94b1209db3b2afb5275b80097ec831dbff0dbe3da3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a PDF link farm. One of these links, 'https://cctraff.ru/123?utm_term=onora+o%2527neill+kantian+approaches+to+some+famine+problems+summary', is flagged as a known malicious redirector. The ML classifier and ClamAV detection further support its malicious nature, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=onora+o%2527neill+kantian+approaches+to+some+famine+problems+summary
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f95d7a76db44.pdf
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/dewekodegurowajoxa.pdf
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/sosumesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/goviwigax/dark_mode_for_chrome_android.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcee63ef3361272aea9789/1606217315882/3704523509.pdf
    • https://s3.amazonaws.com/zewimu/alison_courses.pdf
    • https://s3.amazonaws.com/metubevozisul/instrumental_music_you_raise_me_up.pdf
    • https://static1.squarespace.com/static/5fc29726239b0722913c1018/t/5fcc5f0205ddc9599d17e0d5/1607229186950/tinodavirozaxuwutirugeji.pdf
    • https://s3.amazonaws.com/voxulija/79695724335.pdf
    • https://s3.amazonaws.com/jemazejodep/58887085607.pdf
    • https://s3.amazonaws.com/sigobija/31060161123.pdf
    • https://s3.amazonaws.com/xefejevife/37477866816.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ca.bin
aab98e789cdd457d2428d8d94d1e71307970c01c35f940408b7583b5416d1353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CA 5504 bytes
font_01_sfnt_off0000d558.bin
c8094cc6d1d2a27c7844792b04771f5a3e2b3a89affd4eee915434f246046a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 11264 bytes
font_02_sfnt_off0000fa8c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 4324 bytes

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