Malicious PDF — malware analysis report

Static analysis result for SHA-256 05252b992f7c6182…

MALICIOUS

PDF

77.7 KB Created: 2021-04-11 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2874cef624cb7de01ac61b7065c05ae1 SHA-1: d0feab751e9527e0c1c171162f940184cecf3456 SHA-256: 05252b992f7c61822a3f4ceac0ed718b6f0bda7c90134daabd106986372951b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs, such as 'https://vilenefex.ru/strik?utm_term=how+to+type+latin+characters+on+iphone', suggest a phishing or SEO spam campaign designed to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure and link farm heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+to+type+latin+characters+on+iphone
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/8eee75ac7de8eb.pdf
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/gitatazev-wojiwel.pdf
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/gibogawobu.pdf
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/gekog_ganufolef_wegisiwi_vebusev.pdf
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/3020762.pdf
    • https://mirinojasuri.weebly.com/uploads/1/3/4/5/134588432/1771744.pdf
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/5996590.pdf
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/8077748.pdf
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/fuwixuweseweruk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_754b558d1b164f018d7fbce054002b54.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_0fa4b058ab3141f997a4482ee6c87f3f.pdf?index=true
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_cb8cebfea29c467c9588dd7f316853af.pdf?index=true
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_dc47e9e14cda4d7eadaa848972737f73.pdf?index=true
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_266a37747c2e4de19421fd60873d319e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/459e3db1-538a-4f30-8d82-c3371bc606a6/edexcel_as_a_level_biology_b_student_book_1.pdf
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_41148dccd8094a9ea2ea3944f5abc54e.pdf?index=true
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_7e9183653aff47e0abb29c46630b8709.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_3d10c60b8f5b4f4c8098784890e52070.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0252b71d-5ccc-481e-95fb-d0609c0323da/how_to_think_like_leonardo_da_vinci_100_questions.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_2b66bdb76c4a4aa4b7ac6fd331b49639.pdf?index=true
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_cb6a2b358d17486c9dcc67a5e372f8e3.pdf?index=true
    • 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_off0000f061.bin
f9e300f20d80aa214c3049e5b136fb147c6bf63d4932eebd2c97e4fcfee8f015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 5176 bytes
font_01_sfnt_off00010205.bin
a52c3e535d0b1ca3e85c5452e61bc8e9f7a4225e4b0d2d3fc9b2554c75b6307b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 11700 bytes

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