Malicious PDF — malware analysis report

Static analysis result for SHA-256 329930243d0a9052…

MALICIOUS

PDF

73.9 KB Created: 2020-12-30 04:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2f55dc112bebdd72ef6fdf084021f917 SHA-1: 918c6cd5c1ae1b3b3685c94f383aee7173a7a2e7 SHA-256: 329930243d0a9052d76cfb61ce03a7f89498d8b67f3b70c22b09b5baa246b977
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. One of these links, 'https://trafftec.ru/123?utm_term=broiler+feed+formulation+book+pdf', is suspicious and likely part of the malicious activity. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/123?utm_term=broiler+feed+formulation+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f94e79e3fb71.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/zowenomak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fa04f06bb58d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dekogamik/wordscapes_level_116_arch_4_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a237af-3951-4aac-8b22-49697306fc65/18764670641.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/16576702811.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/fotaremikojupomowavuses.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/70331594857.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/hypertension_guideline_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/tolland_public_schools_lunch.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/colour_acrylic_sheet_for_sale.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 5260 bytes
SHA-256: 5f363464ab4f469c85c61f1c742c720efc4929a77ae850c3f3e549307eb26668
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10884 bytes
SHA-256: 680f80d66b94f5713fa6bacc153c119c4623597ccf524a362a64a6585b83fdbd