Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae5f0733677b59f…

MALICIOUS

PDF

87.3 KB Created: 2020-11-17 22:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3b856f8b21e3460dba8604b1fb8443f1 SHA-1: dd25b83acf0ce2ff60aaaa4d35707bea86ed103b SHA-256: 9ae5f0733677b59f569862aed1c1a29ee8ebbce155242b24849e3ff95772bf5a
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://trafffi.ru/strik?utm_term=aparelhos+ideol%25C3%25B3gicos+do+estado+louis+althusser+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5fa6ff5d39748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f96a672cd4a3.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/975526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_5fadcbfdf3405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5faf9db0423d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f8b7d3334b6c.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/lejesof_jenizo.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/golojefanosila-sasogorowisi-zanek.pdfIn PDF document text
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/ludijanixamobipeliw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8eb286610c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zazelujeju/autodesk_inventor_2015_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/18650952489.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/71135334328.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/sawyer_hartman_camera.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 5316 bytes
SHA-256: 224c5086abc7fcac160a4b20c7d07db75a64ca6a53c5fa8e74788ff09882e6e5
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 12376 bytes
SHA-256: 77eb93064b6c05a9d82f1efa8b6de37443bf7b79303b60e894fab43d5024f29d
font_02_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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