Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aba4e89692b4bc…

MALICIOUS

PDF

69.6 KB Created: 2021-05-26 15:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180cd1ef4b582b52166646c467f06c1a SHA-1: 143b8b7d3b1c538b22a75120b65865c7bd381701 SHA-256: f9aba4e89692b4bcc7b47175703ebce6320a518cc5132a486bc55eccc291d7e0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various Weebly and Strikingly hosted PDF files. The primary URL, https://kuzutuzo.ru/strik, appears to be part of a link farm designed to manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest a malicious intent to redirect users to potentially harmful content or facilitate ad fraud.

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-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://kuzutuzo.ru/strik?utm_term=how+do+you+determine+the+osmolarity+of+potato+cells
    • https://delupizamima.weebly.com/uploads/1/3/4/5/134578079/74a86.pdf
    • https://notagudoda.weebly.com/uploads/1/3/0/7/130776089/towijadifijak.pdf
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/tejenakevoxipa.pdf
    • https://bijararavi.weebly.com/uploads/1/3/4/5/134587429/zumagukegixisi.pdf
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/finupaxudukaga_gudigulelimevut_banofom_vagasusume.pdf
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/a2cea92df83.pdf
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/jojudigun.pdf
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/bc632c76.pdf
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/kotofafufawamo-loworazilaza.pdf
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/8fd5d5c6d13e.pdf
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/6569879.pdf
    • https://jemusutagutuf.weebly.com/uploads/1/3/5/3/135390091/vupujusoza-besorufonalo.pdf
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/vitabex-lotazom.pdf
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/d95fe6f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abde077b-4f96-40b0-8836-d53b4dae2a66/oster_food_processor_wont_turn_on.pdf
    • https://uploads.strikinglycdn.com/files/6cdf1155-62ab-4f4d-b938-68df7c9e5185/62171484727.pdf
    • https://uploads.strikinglycdn.com/files/37be1a2a-beb5-4505-9d94-4ff24b57c3a1/what_is_a_good_ice_breaker_for_a_meeting.pdf
    • https://uploads.strikinglycdn.com/files/3950f616-6829-4ad7-a08b-d2d72587b20a/how_to_find_probability_in_excel_2016.pdf
    • https://uploads.strikinglycdn.com/files/f8cc5b92-c6f8-4a18-9924-5c67f2461c33/jeluboxivuzipulopi.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_off0000d0e3.bin
0921774fc844a3d9bd3668515e3af109d63cfaf1d5c8a1e3f060c1d60c8b4b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 5552 bytes
font_01_sfnt_off0000e3ac.bin
14f1768214c2fa09652610a6c2aee5d454fedbeb14946a0fa91266a9a008277c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 11068 bytes

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