Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ac45538b1b9ece…

MALICIOUS

PDF

79.4 KB Created: 2021-02-10 09:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: febce79564e9db6259a00004410dd37e SHA-1: 2ba17d3ae3a12dae66b306fa9fcd8b9d3946e77a SHA-256: e2ac45538b1b9ece2368f579bf7be321ea202e5053e778fbf582e29a6dafcc04
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crophysi.ru/wb?keyword=cpt%20test%20questions%20and%20answers In PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/moraganumi.pdfIn PDF document text
    • http://airbin.top/78570082518mdwds.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/xibibesaroret.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/english_grammar_worksheets_for_grade_5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_600738ac3e947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fe0990fd5f35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5fcfe58ef1378.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/nozalotowijet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ffd2023cbc7c.pdfIn PDF document text
    • http://opensalle.xyz/tamil_songs_online_oldpanli.pdfIn PDF document text
    • http://feboxazatoran.22web.org/67906724462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384026/normal_5ff961bc8cb6b.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/bejokazemur/theme_park_games.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/kefumagup.pdfIn PDF document text
    • http://kugibujupedo.rf.gd/glencoe_health_assessment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/livaluzele.pdfIn PDF document text
    • http://duvufewitopemaw.rf.gd/warovekawiwogalemi.pdfIn PDF document text
    • http://zepedijuva.epizy.com/free_english_grammar_worksheet_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/bosanani.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_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5044 bytes
SHA-256: beeef2cb8205360cbe047e99913961c18ee6d28eee0607f66f1d63cd0438ff33
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10840 bytes
SHA-256: ecb4ef36c1e3234ad432bbc5c925ad68719f13a2741fbb863702d49f6ad0c94b

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