Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a948e7f9fc1964…

MALICIOUS

PDF

66.4 KB Created: 2020-11-22 21:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a879b5c725b24690791b410f50ea57c SHA-1: d687a941e4ee2785bc8e219dad2ff99825d90c29 SHA-256: b2a948e7f9fc1964e9ada5aff53565d37181225dd5b69a12f10635a99f13881a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL 'https://trafffe.ru/123?utm_term=california+8th+grade+science+curriculum' is likely the primary lure, directing users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=california+8th+grade+science+curriculum
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/862dc61dc6.pdf
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/3955007.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdf
    • https://dogewirezuv.weebly.com/uploads/1/3/4/6/134699505/punujiw.pdf
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/maxunejekiz-wesuxa-vudiwuxapaxefa-garixaga.pdf
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/0545e8c98e8a6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/henghuili-files2/57741568798.pdf
    • https://s3.amazonaws.com/wixamupelinere/benajaxekizebadilu.pdf
    • https://s3.amazonaws.com/patotale/java_worksheet_answers.pdf
    • https://s3.amazonaws.com/woberiz/nusewiwog.pdf
    • https://uploads.strikinglycdn.com/files/b6ef2cec-a738-49b2-9f13-cfa74b94a117/kimball_aquarius_organ_manual.pdf
    • https://uploads.strikinglycdn.com/files/1701411e-09b5-455f-81c6-72cb2f061d5a/88421945797.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e5.bin
3c930808fdbb5b05cb2f35468a7e78f0fb01cd9334104a9dc43dcb5884bb620e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 5536 bytes
font_01_sfnt_off0000d984.bin
de560ee73acae119772450db024589bf9087daa81c5b4486de392566199f0027
pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 10404 bytes