Malicious PDF — malware analysis report

Static analysis result for SHA-256 486c26e8ba9a4676…

MALICIOUS

PDF

77.0 KB Created: 2021-02-06 08:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5be10e449d4b9995ac7dd8ffb767eec3 SHA-1: 187c4e0949bf85803ae588c884ba38ff816b875a SHA-256: 486c26e8ba9a4676c711ec69d722880c9f3653d7eb8d89a11eeb4b6db943bdfe
126 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and contains numerous external links, many of which are hosted on disposable domains or have unknown reputations. The document body, though heavily obfuscated, suggests a lure related to a clinical practice guide. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, likely for SEO poisoning or phishing.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wb?keyword=absceso%20hepatico%20pdf%20guia%20de%20practica%20clinica PDF link annotation
    • http://subumobo.22web.org/munufopuxaxusuwafofe.pdfIn PDF document text
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/meselu-mulasezowigo-werisowomenixi.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/8442460.pdfIn PDF document text
    • http://streichpack.online/viwujezarl5ac.pdfIn PDF document text
    • http://rimka.xyz/61116600890jczt9.pdfIn PDF document text
    • http://accface.in/sixovizetumatepoovok.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/579068.pdfIn PDF document text
    • https://cdn.sqhk.co/rajosibakulu/5ifWhhv/wunigereterizu.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/hjjfjdB/bajeno.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potofaw/surah_kahf.pdfIn PDF document text
    • http://tubofebagadupa.epizy.com/marksheet_verification_nios.pdfIn PDF document text
    • http://lekinip.epizy.com/transformers_prime_fanfiction_arcee_and_airachnid_lemon.pdfIn PDF document text
    • http://xofigawarogipiw.rf.gd/nijasokeziwopofufano.pdfIn PDF document text
    • http://vadepik.epizy.com/chrome_76_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/wijepixekukevizagojumiju.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/totomup.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 1604 bytes
SHA-256: a90f79d35b855d6e419c922e1c16a7f20c875ed03b3e5f8d6d8c2638309ac592
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5544 bytes
SHA-256: 756a3ef5b90bb6236e1bd9ba280a7fda0b8a2bc62dd01c1b44accd89ab99c4dd
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 12400 bytes
SHA-256: 8f69e72739efe8a48f8357d502b0ed86e28a81f8d9caab96549dfe9b0711a18b

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