Malicious PDF — malware analysis report

Static analysis result for SHA-256 1809abbdea1a079a…

MALICIOUS

PDF

138.1 KB Created: 2020-11-23 02:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec69720562783a60dea86fc67954e6cd SHA-1: d4fd9c70e8ad21a4b14815ff97d5e20933f6f077 SHA-256: 1809abbdea1a079a50f9466f92f66bc2fdffb131dcbe3030b5cfd0ed1193cc6f
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://traffking.ru/123?utm_term=smoldering+engi+research+station, is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/123?utm_term=smoldering+engi+research+station
    • https://gituwere.weebly.com/uploads/1/3/0/7/130740556/safiwoziramaz_mozusizazag.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_5f9d2301c5e43.pdf
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5fb50a0c6df93.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f91119259b26.pdf
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f9584a25cc9f.pdf
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/9927455.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7c863620-5e87-45ac-8ce8-f473d659971d/68632474013.pdf
    • https://uploads.strikinglycdn.com/files/73c1b514-699c-4bee-b9f9-2377ef06834a/6308535505.pdf
    • https://uploads.strikinglycdn.com/files/ed51c779-3202-4cdb-8784-d4009c22a839/dynamics_of_structures_theory_and_applications_to_earthquake_engineering_solution_manual.pdf
    • https://uploads.strikinglycdn.com/files/5ae86b8d-4a20-450e-a7a7-c7378f2cbe27/xotos.pdf
    • https://s3.amazonaws.com/mupudipuvo/lalojukemogujuvajijon.pdf
    • https://s3.amazonaws.com/dikobepibelun/desactiver_notification_chrome_android.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_off0001e2bc.bin
70df1ed5e702b4405c485411b20f8702a795b48a2789c5462b0b1fd20d19cfa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2BC 5456 bytes
font_01_sfnt_off0001f516.bin
6963fdde3b172b5c7604e67a7924162bfecc8f33d7fb7b7f0f4fd9307cbeed45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F516 11112 bytes