Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb4de93cc9b734f…

MALICIOUS

PDF

60.8 KB Created: 2020-11-21 22:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e512913dd2f19148ce0d8a9c4f739c7 SHA-1: e5228a532c54f08d43a266c4ca2b0f682dd6f6ee SHA-256: 3bb4de93cc9b734f00271e0c757b7ce5cbdd8e79e7436d1daf594a32564fd417
172 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. It uses an urgency-based lure. 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 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafftec.ru/123?utm_term=a+doll%2527s+house+ibsen%2527s+myth+of+transformation+pdf PDF link annotation
    • https://ritenevibufu.weebly.com/uploads/1/3/4/6/134639535/9254249.pdfIn PDF document text
    • https://tazusarativiwu.weebly.com/uploads/1/3/4/5/134510609/3409069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f923b7f9d2d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f89b760f00ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f926d1f92e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5fac5519a8a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5f9097e0be57e.pdfIn PDF document text
    • https://setekonireza.weebly.com/uploads/1/3/4/1/134131298/bf415d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f86f83be9674.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/c7972e3e-647e-4b59-b1b9-e00163a9657f/zaramusevevuwisewu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/21583936421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1a14fd-259c-462a-9415-0ebeb4f5d961/nujesikivelitulovum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b80112-d348-4e3c-9b1d-d50c1311600c/goguvusawedigopa.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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 5548 bytes
SHA-256: cb8b37f9507e62fbdaa137ca5f90586590b53b9a8d4c96d852c895da02b92c68
font_01_sfnt_off0000c23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23E 10620 bytes
SHA-256: df929e6c481bcec9296195f3d4c04f0b4225a59e7d1cf1bf579df1dd8ae28aae

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