Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c9fa4e28790d7e…

MALICIOUS

PDF

93.4 KB Created: 2020-11-26 14:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eca2e83260a482918f419a2d9812e86a SHA-1: 601bf1eed9244fe1f5bb9235243c9365da6ffff4 SHA-256: c4c9fa4e28790d7e55372ba7f8e98b14faf694fc44ae2b69dccd3b9f191c9ae8
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 0.9998

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/123?utm_term=anne+frank+the+diary+of+a+young+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413969/normal_5f979013eaead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_5fa1b88f4052c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fa131e21ba21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fad495217442.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kezanerodewukew-sijulamigikizox-vutugimun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_5fbee6ed550cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_5fb343db9514d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5f93c121db17b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f90f6bed9341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fb62a34775c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8da61b94df6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jijumupade/dyslexia_and_low_birth_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/motedisen.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/43442138262.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/is_aluminum_fcc_or_bcc.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/74023537067.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_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 5644 bytes
SHA-256: 0626fe42be1c00596c130ee4ca3aa7dae77a654222937e6a112e83338a3427d3
font_01_sfnt_off00013883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 15328 bytes
SHA-256: 37b5859f862ab0e78506e7d31f94bb347481ee094a7db20f0e5a460413b3d2d9

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