Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9118a65e21bd1c…

MALICIOUS

PDF

75.5 KB Created: 2020-11-26 23:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2d19544561d510f5f8a46894c3fc23c0 SHA-1: b9c03bb9defac3048d8fb1e0c08e38f9a759d6ef SHA-256: 4d9118a65e21bd1cf1fcd70e7c2c79f2983cf0dcd7606d7c691f39440670c1c5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as benign PDF files, forming a link farm. One of the extracted URLs, 'https://trafftec.ru/strik?utm_term=hey+class+president+chiga', is directly associated with the malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=hey+class+president+chiga PDF link annotation
    • https://netewubo.weebly.com/uploads/1/3/4/3/134325031/mawuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5fb694bcaca3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8aedc7c57e3.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/fokapikow/romanian_folk_dances_bartok_violin_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/full_form_of_kgf.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/apowermirror_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/mhw_longsword_combo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/lavexepunisedufoboxoli.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/78631033074.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/guvubegefazugozozex.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_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 9064 bytes
SHA-256: 08d97efbc7d79af76710d0223bb9f1808e506d04839cfb474556c93641cf36f3
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 5400 bytes
SHA-256: bc2ea9e73d1659665b4d0fc1fe66ac9894162c556c01f5a9f1c9c67b37c8ff14
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 11520 bytes
SHA-256: b635af05bcf8bd242296c1c4aa4488b9c06f5e66464615b4c7ac603ccd55ec84

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