Malicious PDF — malware analysis report

Static analysis result for SHA-256 296494847e55227c…

MALICIOUS

PDF

90.4 KB Created: 2021-04-06 03:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c3fb76ffe111755da56e02576178d622 SHA-1: 46f26c8e50819a51f19498030e79d3de47324304 SHA-256: 296494847e55227c3bf90b9b429b25ddd1aca5ce26dc143931a1dc6d7ab77272
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=anomalias+dentarias+de+posicion+pdf PDF link annotation
    • http://manibupefif.mypressonline.com/problem_in_mathematical_analysis_1.pdfIn PDF document text
    • http://kulinar2020.site/60456170854rl96a.pdfIn PDF document text
    • http://armlur.space/how_to_fix_google_maps_on_iphone_6t2s7w.pdfIn PDF document text
    • http://sozawakofuriwoj.getenjoyment.net/dedanesakitep.pdfIn PDF document text
    • http://kind-insta.site/3m_filtrete_thermostat_instructions2eaeh.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/split_mac_preview.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/what_does_one_split_second_mean.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_8cd1973e2f1a4aba9bc877b69c7fb7ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/44554619759.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/aha_guidelines_stroke_2014.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_45e0312d787f4f8ca1f29d6da6c3094f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/34000121275.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/rukogapixekixed.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/string_format_apex_class.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/80763622283.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_006750c4256d499e842c8fb38674d851.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_a2c7dd1a9bd843ac9e22b887d4f8552b.pdf?index=trueIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_f96302bda2094ff5a69160a78a36c655.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_7d475aefff1b46e0b652d6998e158893.pdf?index=trueIn 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_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 5288 bytes
SHA-256: 44aacefaf4952f20c08f46c82246337ed71e9d7fe7e184b42ce59a23e6952a1f
font_01_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 13572 bytes
SHA-256: 444e48f2dd135be30080914ee6f36426444fad8b59ff41530cfe5ed6c11d29fc

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