Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb860f69d9e6423…

MALICIOUS

PDF

72.0 KB Created: 2021-03-13 14:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a05601ef5f7d04faa6faecd03f37a66 SHA-1: 22c040ee9121cd5185a65bf2c402f5a7ec41ae79 SHA-256: 4fb860f69d9e6423557f2620a4b7db5a4ec7878519f90ac846ad06e88d8769ef
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. The document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. One of the primary URLs, https://resalured.ru/strik?utm_term=dcs+5020l+setup, appears to be a lure for a device setup, aiming to trick users into visiting a potentially malicious site.

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://resalured.ru/strik?utm_term=dcs+5020l+setup
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/fb90d94da1c096d.pdf
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/wekusefotuvuz.pdf
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/a56cfc0207034.pdf
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/3625389.pdf
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/6002098.pdf
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/gififupujivabe_birikupogana_noxomu_wijuzibep.pdf
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/2329683.pdf
    • https://lipemegovaw.weebly.com/uploads/1/3/4/7/134766771/lalolusidunevazivile.pdf
    • https://wemeguxenuvoj.weebly.com/uploads/1/3/3/9/133999449/fac3e443.pdf
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/dugojizexek-jodadifatajito-defivole-susaju.pdf
    • https://zanazajerepa.weebly.com/uploads/1/3/4/0/134012527/759d26d71ecab6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wiremeresegikon/factorio_speedrun_guide_0._17.pdf
    • https://uploads.strikinglycdn.com/files/f149aa94-01bd-4aa4-af15-7d37e72d4e0b/ludunu.pdf
    • https://s3.amazonaws.com/fizufapu/environmental_incident_reporting_procedure_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/18900182-ea50-4dbc-bc9e-bb50ddc3c0cc/will_cyberpunk_2077_have_online_multiplayer.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_off0000dbe6.bin
38cdf593fb0c3de71c2ad67e1a61e5a85c1dacaf258af1674b7dcba4fdff74fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 5016 bytes
font_01_sfnt_off0000ed20.bin
10eaa44933834cb881cc019c6ffdac782dafa5131653e82291d485b86e5f46a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 10876 bytes

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