Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a26554812a8e6b3…

MALICIOUS

PDF

75.2 KB Created: 2021-02-12 01:37:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 974a6b3d94bd38788c2530281f4ae341 SHA-1: 52fd09af44bac84e79a7436f6b107b52726efbe2 SHA-256: 0a26554812a8e6b35c12acb0a89e664f64084987d0f1329c67413abca03220fd
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://yafferge.ru/wix?keyword=delirium+pdf+lauren+oliver+espa%25C3%25B1ol'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains text fragments that, along with the 'SE_URGENCY_LURE' heuristic, suggest a phishing or scam attempt to trick the user into clicking the malicious link.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/wix?keyword=delirium+pdf+lauren+oliver+espa%25C3%25B1ol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5fe8ff04788d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5fc6c01a9d0cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_5fe8768fedbcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidetorula.rf.gd/22754096.pdfIn PDF document text
    • http://kuwoguki.epizy.com/39865879750.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/64224893116.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/nuwegoxijujemoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/comedy_videos_free_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/henderson_land_annual_report_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/wiwoseladowozopepop.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/aptitude_questions_and_answers_for_mba.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/4917821475.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/76987606340.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/fuxisaworawosibo.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/48037097087.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 5460 bytes
SHA-256: 5925c4508f295986e298e0fcb0c6b5c9360a3ef40a723c8dee9e6837cc5fb99c
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 10376 bytes
SHA-256: 97a77c7a3992d872608440c438ffd575638238a55f46bd7b7a19d79d84fd5490

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