Malicious PDF — malware analysis report

Static analysis result for SHA-256 e810970fbb24f788…

MALICIOUS

PDF

73.3 KB Created: 2020-12-03 21:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b912d980648080e6d51fcc72fd54e6f1 SHA-1: 7884877c63804f17afbec93d4b666598261f5064 SHA-256: e810970fbb24f7885c6c6b571c382a52e6538cf3604fea37d7c5e19c6ed46ab6
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or a method to distribute further malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=guide+osamodas+wakfu+2018
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/danuga.pdf
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f9eb9d4ebb8f.pdf
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/4f0176.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f8801c248dfc.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fad499de2ffb.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fc5063670d5a.pdf
    • https://rezolokad.weebly.com/uploads/1/3/4/7/134718373/soraja.pdf
    • https://cdn-cms.f-static.net/uploads/4467300/normal_5fb8d7cad033d.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5fadf69d2d4df.pdf
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f95420bdbef7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mufukep/aisatsana_piano_sheet_music.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/nesevizavekolelabowewax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e086.bin
6c81b4b8bcbb6ba859483fd1093542cde0d7578ac930966509a2a0ce0e596a37
pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 5632 bytes
font_01_sfnt_off0000f3c4.bin
a3bd12c76807a04a217e90e3ab8112a56d35a8d97ea1a6f82f53ed2af4c425c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10768 bytes