Malicious PDF — malware analysis report

Static analysis result for SHA-256 130702d634dc8618…

MALICIOUS

PDF

65.3 KB Created: 2020-12-17 19:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d6fd5856888e7250317392f35ab4ff SHA-1: 7451d3ab4580dc28e66ac2ae10ad9c1b44a1300c SHA-256: 130702d634dc8618704aaf5c25354f53e217c5020d4ea2d6c925216f180c481b
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=manual+towel+wringer
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fceb58b7ba32.pdf
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/065a0e.pdf
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/7452385.pdf
    • https://cdn-cms.f-static.net/uploads/4388063/normal_5f8e619be13f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85976f33-980d-4361-a53e-159931eacd65/2686732441.pdf
    • https://uploads.strikinglycdn.com/files/00ad163e-2ed1-4c17-a982-f797893360f6/tipos_de_echinodorus_rubin.pdf
    • https://uploads.strikinglycdn.com/files/921552bc-7c14-465e-8673-83a4b1a12df6/ruzuwilewezuvezivekozure.pdf
    • https://uploads.strikinglycdn.com/files/b7588b37-4fe8-4bd8-a3f3-ed8a361279fc/vinovajarezosinutanomize.pdf
    • https://uploads.strikinglycdn.com/files/2d96bde7-86e6-4431-9abe-76e5230ea4f6/plan_de_estudios_2011_secundaria_ciencias_biologia.pdf
    • https://uploads.strikinglycdn.com/files/8d763c90-dac2-4bc5-b009-9cf56288893a/sevowizogisifop.pdf
    • https://uploads.strikinglycdn.com/files/89a966a9-ec20-4667-a1da-1c9ad29caad1/jekawefemotiputid.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_off0000c60c.bin
82cd0f02e460d976edd71ee5904adbdda74b1531a3680127c859ee90c49f9424
pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 4772 bytes
font_01_sfnt_off0000d673.bin
fb3c44793d6b4fb38e67f0b1e0a2a930be704fad164168844d4e2c93df81086c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10068 bytes