Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ea5f66850ee1a5…

MALICIOUS

PDF

93.1 KB Created: 2021-04-07 02:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec57948ee35b9fcbc294918f8fac90c SHA-1: 523967dc1f74b7116e8f7ba0219fa37d445b9187 SHA-256: 09ea5f66850ee1a5f13b05ad7864479e5bb9bd804628d15d5140267257fa7af0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO spam tactic to drive traffic to potentially malicious sites. One of the primary external links points to a URL that appears to be part of a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=alimentacion+saludable+en+el+peru+pdf
    • https://cdn-cms.f-static.net/uploads/4460461/normal_5fdc51e99d2a1.pdf
    • https://cdn.sqhk.co/jekuzedu/jhb1hjg/54494661458.pdf
    • https://cdn.sqhk.co/dijowasedop/mAo1jhq/pujarejevivinasisasal.pdf
    • http://soxutabuxupene.22web.org/60121330841.pdf
    • http://loxapul.iblogger.org/sotolosarolono.pdf
    • https://cdn.sqhk.co/zanotunuzi/YtjcDY7/8723426234.pdf
    • https://cdn.sqhk.co/tisezalave/eOwxIjf/digestive_enzymes_definition.pdf
    • https://cdn.sqhk.co/tamenotu/gfzgjPq/47740110371.pdf
    • https://cdn.sqhk.co/nepajenine/eFpQAgi/pirate_kings_not_connecting_to_facebook.pdf
    • https://cdn.sqhk.co/fuperule/iajcSij/biwokexunod.pdf
    • http://votexetoke.iblogger.org/o_capital_boi_tempo.pdf
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5feb6a058eb66.pdf
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5fc924f62d5ab.pdf
    • https://cdn.sqhk.co/tejilunuf/7UhbSig/download_ace_fishing_wild_catch_hack.pdf
    • https://cdn.sqhk.co/xidupesijij/ja0idkf/44258261818.pdf
    • https://cdn.sqhk.co/xusarukave/jasJgjs/23088627289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_44f28836dfc140928935799415074582.pdf?index=true
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_3eb6aa7562344e60a4b06fff0a7f8dfb.pdf?index=true
    • http://wuzuruwevirelu.rf.gd/toxujugaforovawiluzilinam.pdf
    • http://jepisaf.epizy.com/4969407467.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_93e54f4266804ecba54807dabd4a7859.pdf?index=true
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_1e3480aee2ae46f4983ca3ec3531eec2.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_off00012b78.bin
a2f80bf9bc787d371ea1401ef4cf0c3341376e776913979255e5eb2fac0e12fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B78 5432 bytes
font_01_sfnt_off00013dcf.bin
6bd4908a73967ad8aec38c18d0e4329bbc73bfd96816d91155f6eb50728a2cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCF 12080 bytes

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