Malicious PDF — malware analysis report

Static analysis result for SHA-256 528c66c663dce63f…

MALICIOUS

PDF

86.5 KB Created: 2021-02-23 04:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d7982598e881455992fab432e03b6efc SHA-1: 493fa755faefbbc0585e47fd9a15a1ee89df504e SHA-256: 528c66c663dce63ff9c54f3ef0d2de8694374386e01edd07add6662959cc98d7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/123?utm_term=what+are+textile+techniques PDF link annotation
    • http://xekugesakurupab.22web.org/how_to_start_craftsman_lawn_vacuum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392647/normal_600474d649290.pdfIn PDF document text
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/3889770.pdfIn PDF document text
    • https://feditesar.weebly.com/uploads/1/3/1/4/131483001/7308336ca.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/lojofideref-zirin.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/7538753.pdfIn PDF document text
    • http://detonic-deutschland.website/chemistry_classifying_matter_worksheet_key4odgs.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/668cd.pdfIn PDF document text
    • http://cosmostil.top/28083865494ujha4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd65b8f454a3.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/woxojuxafopuv/contoh_report_text_beserta_pembagian_strukturnya.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/1883199838.pdfIn PDF document text
    • http://lofuwokapowudug.rf.gd/99681355019.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_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 5096 bytes
SHA-256: 69fb2f8d7a646024a96ac99119a221d8efb5482401b3f6ce6bd5355c4048e0ed
font_01_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 12068 bytes
SHA-256: c9a6199a7daa8ef5984429eaec61662cdec05ea2d9dc3ad4318941642cf2d5f4

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