Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a0d0a3a3ff024a…

MALICIOUS

PDF

66.7 KB Created: 2020-12-16 02:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a2fb52023ec86ec601aae286278f9e33 SHA-1: 9f825a0454314a824e347fa98a24eb74e38cc81a SHA-256: c8a0d0a3a3ff024ada8977f346fe98f4098aa967bd5cb9db41d9b2442bd282cf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of external links, with one prominent URL being 'https://traffking.ru/aws?utm_term=free+excel+bookkeeping+template'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malicious content delivery intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=free+excel+bookkeeping+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413361/normal_5fa8a27ba92b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f87736f8e39d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f879d92e79b9.pdfIn PDF document text
    • https://sapurokegija.weebly.com/uploads/1/3/4/5/134577933/356369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5fd03cb40354f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fd1d38d2d05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_5fc364902bfd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34edf8f-ad28-4529-a75c-41a1e26f167c/farajifajurojanezirov.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/goodbye_card_to_coworker_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05692e90-0e74-4be8-9e6d-6587d6974ed6/xobigudiwefuwofenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d23f4f9-eaef-4473-af7a-9caf7ccd667e/van_isd_transportation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ec4e36-b852-4ef7-9b6e-b7eef101320c/pokemon_black_2_white_2_team.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db23379f-166a-404d-ab52-88ad11bf2701/fofipaselitunavupexe.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_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 5304 bytes
SHA-256: 88a723fdee8029313f0f6b6fb3cc245a4c553494297c30ccf0d477ceab3630b9
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 9812 bytes
SHA-256: 198225c0ced63a732be77ab461e5a9ee971e5697b932b92135f3afb0bf0b3140

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