Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee4e93364226fa…

MALICIOUS

PDF

92.5 KB Created: 2021-05-18 22:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f8ebd9fc0182df9ca091e9223ac19af SHA-1: d68d4164c068a4e7db51bb4624be95f6076e8a25 SHA-256: c3ee4e93364226fa437177a2dc7bb98c3419fb34222c264580300790f92b16fe
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to PDF files with numeric slugs, indicative of a link farm or SEO abuse for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=unit+4b+conservation+of+momentum+worksheet+answers
    • https://lawoxotat.weebly.com/uploads/1/3/4/5/134587222/bb4c8bd170980.pdf
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/kigamajakaf.pdf
    • http://tunulawofu.iblogger.org/gepezowikorabizeseburi.pdf
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/vidudijadijaxuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvojugejoxip/kizazepezo.pdf
    • https://uploads.strikinglycdn.com/files/066c36e2-b6c8-432c-b5c7-1bf0984eb5b9/gefupe.pdf
    • https://uploads.strikinglycdn.com/files/359f289e-4332-4217-9fe9-5b446f56b8b9/73512365222.pdf
    • https://s3.amazonaws.com/mefadedosuw/42060957692.pdf
    • https://s3.amazonaws.com/pokorevalaxex/15777747498.pdf
    • https://s3.amazonaws.com/kozibowisenatu/wiruvuzikaruligisa.pdf
    • https://s3.amazonaws.com/tuxexi/41912800627.pdf
    • http://fopajika.epizy.com/32390285525.pdf
    • https://s3.amazonaws.com/dubiditiginowo/10273920545.pdf
    • https://s3.amazonaws.com/bulikowexunepov/56425772101.pdf
    • https://uploads.strikinglycdn.com/files/8e25c0bc-ef0a-4398-b4ca-5f1f37907c43/what_is_the_cost_of_an_oxygen_concentrator.pdf
    • https://s3.amazonaws.com/pubopelej/spanish_1_vocabulary_lists.pdf
    • https://uploads.strikinglycdn.com/files/c3bb78c2-734a-44b4-9229-4651925b389e/best_coding_language_to_learn_for_jobs.pdf
    • https://s3.amazonaws.com/zurovajij/spreadsheet_meaning_in_tagalog.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_off000127ef.bin
7d3d588fa8445e6c59bb11995579ec947180433a1ddbc40a7b249e4168d53fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 5524 bytes
font_01_sfnt_off00013ab3.bin
9bbd1053d96465595bf7eab439e866c9faabc3fc35ead83ae84893093d081978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 11692 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.