Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d48422e207c82d0…

MALICIOUS

PDF

76.9 KB Created: 2020-11-13 02:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce9a33f9596dcb5ca66850fcca2088a SHA-1: 5a719f2de812f6936e7f7d100d28207f39e75a97 SHA-256: 3d48422e207c82d01cf8b9d836258e48abbc9a02b9363af0a24fa6e5e136fceb
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 identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. The presence of numerous external links suggests a link farm or a method to obscure the final malicious destination.

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://gettraff.ru/123?utm_term=who+are+the+folk+by+alan+dundes
    • https://labiduto.weebly.com/uploads/1/3/4/5/134584073/c25675f26650.pdf
    • https://lizapomed.weebly.com/uploads/1/3/4/5/134511268/0ed29d.pdf
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/6728466.pdf
    • https://cdn-cms.f-static.net/uploads/4413374/normal_5f97f8e01fb24.pdf
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5f8e23d43eafc.pdf
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/611751.pdf
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/magepugogegotev.pdf
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5f9aee2378a33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/muvemasoxaji/77474605946.pdf
    • https://s3.amazonaws.com/fapaga/jalijoboxalilowage.pdf
    • https://s3.amazonaws.com/forupokisip/16033284003.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_off0000e1a4.bin
283340853933ac2269b9700233014f2d6dc9a726be942e505959bd19235b7e50
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 5148 bytes
font_01_sfnt_off0000f329.bin
2d3415a1f7f42404266427db1bd3c20e7927f80cf3b200e8c09ef25f509a90eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 10972 bytes
font_02_sfnt_off0001189a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 4324 bytes