Malicious PDF — malware analysis report

Static analysis result for SHA-256 6511eb6a02810c27…

MALICIOUS

PDF

66.6 KB Created: 2020-11-16 22:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6f000d86bfd453bababd3d09341228f5 SHA-1: d41b9b13985b7ca6ade2a554a98852699c4f21a3 SHA-256: 6511eb6a02810c27f4cf16dcbe57ec1dbc336683663c69a9bc621c499f4e73ff
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?utm_term=vshare+for+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f89d5c8e24c7.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/6028450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f97e020b1967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f871fdde22fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca66a217-19da-4b08-a525-52a937dde400/4918262473.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/mikevosubusobokove.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/12082744806.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/75669727030.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/60519835845.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/best_emotional_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/sexujufaxepadekil.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 5128 bytes
SHA-256: 58ab550a8e4a3c8c788f9f3e25c4d55210f8f70c2f471169d98c75983a492424
font_01_sfnt_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10884 bytes
SHA-256: 31882da8a58ee598ca200088da1cb111595001188d4d71da7402364ceaaf3a92

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