Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fc307abface65b…

MALICIOUS

PDF

97.6 KB Created: 2020-11-20 09:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 66ef8573dd64d36601f11260f2db498a SHA-1: 178408e25bd1482ddbda5185a13f2dfc81846459 SHA-256: 73fc307abface65bba2b8ce5124d49cf5b9fb0b49fdcf0f0ad7c8e1870d0588d
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=original+king+james+bible+with+apocr PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466661/normal_5fb74cbf96864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8731ba3d452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5fa2a2e290868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fa270f047e36.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/2cc4de7ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f9abe271f11c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fa6e7537b0d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f98641cf385a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f8be1778acb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f8fd32b23637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_5fae6dee0341f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_5fb01d63c2392.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/79e896e0-77ca-4050-be6e-8e1d67a148e1/zefubafogamag.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_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 5744 bytes
SHA-256: 52e8abec6a1073b9e417a481812c5309f1f5f8a6f66be2336de5b9a6f72c2c9a
font_01_sfnt_off00014d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0E 13436 bytes
SHA-256: d8693c7fc1b11c84b9e1d8cdd0f4a8091fb9e900399df27094f2705603d5c14b

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