Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f474210c3d44373…

MALICIOUS

PDF

71.5 KB Created: 2020-11-23 18:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: effab5d7e41c85f2e546a94b368e7b3e SHA-1: dd3a59453e26cc7a59039c24ab6908d31b5d3671 SHA-256: 4f474210c3d44373a5fc4ac9db8479d85b850976094a466b7325b7b8278aab1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://trafffe.ru/strik?utm_term=brush+calligraphy+practice+sheets+pdf', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier 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-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://trafffe.ru/strik?utm_term=brush+calligraphy+practice+sheets+pdf PDF link annotation
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/8f6e469f6557.pdfIn PDF document text
    • https://vosomomoratefuf.weebly.com/uploads/1/3/4/6/134614816/rimunufi.pdfIn PDF document text
    • https://lotufepipum.weebly.com/uploads/1/3/4/7/134702942/2299932.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/4219159.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/zotewug-furasegatevuwin-murolimudixu.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/zonebon/4_types_of_market_segmentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332b7ee3-9b54-40e0-91e9-883a6e49bb8a/zopixatadeku.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/dinoxopikosepusaxolagi.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/salvation_army_donation_value_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dirijazi/43973647985.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/46383452854.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/82081277059.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 5568 bytes
SHA-256: 5a88f9e1caf4568cfbf165ad586958af8e08c44f079fdd245a5466d500b6d9cc
font_01_sfnt_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 10388 bytes
SHA-256: 0d75fe578fdac84ff6974a9aa48024c79b58a1890c3a9d5b4d11b98e852413ab
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16192 bytes
SHA-256: 796abb589046a6794b20638b8f3d5374798c86db7bc0cccf3f694680d91a7597

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