Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cc21aa22712fc4…

MALICIOUS

PDF

61.7 KB Created: 2021-01-25 08:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c115bc7a2e738f7661a26ce932317905 SHA-1: d6afd2887b73dbc0da711da836d45862f6d12f4e SHA-256: 99cc21aa22712fc44d5f6b9c065c9f381ac1017b5c9488639ab864ec7ce87a2d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious content or for SEO manipulation. No scripts were extracted, but the overall structure points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=el+segundo+middle+school+staff PDF link annotation
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/500520.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/joxofagokolos.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/jbgihje/39143199970.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/palepinunejapib_saxov_lomolebatesoza_jutakim.pdfIn PDF document text
    • http://bavedibigilomit.66ghz.com/dummy_s_guide_to_quickbooks.pdfIn PDF document text
    • https://cdn.sqhk.co/jufulezamuko/igzPjjN/awd_php_html_css_js_ide.pdfIn PDF document text
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/midesi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5ff2ac19c0f9c.pdfIn PDF document text
    • http://borezopesane.22web.org/backup_chrome_history_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/eiaibLi/51235710308.pdfIn PDF document text
    • https://kajukijuxuvame.weebly.com/uploads/1/3/5/3/135329863/b66584f74de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fff4dfcd5735.pdfIn PDF document text
    • https://jemikarabon.weebly.com/uploads/1/3/0/8/130815017/japaloni_zajazuw.pdfIn PDF document text
    • https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/1155c.pdfIn PDF document text
    • https://zajuzuvo.weebly.com/uploads/1/3/4/4/134474050/kurajevin-zufusokududa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velefejaforafe.rf.gd/28125225261.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B9 5296 bytes
SHA-256: 6f46c96ef3b8e045faefe96580282f689255f54308aa3c436ca47f0146c04428
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 9792 bytes
SHA-256: c5b51ccf05279a171d4a1a6f018811339a0a04b113c7a574535c76e4de559a70

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