Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e8d1c2073b8c2f…

MALICIOUS

PDF

71.8 KB Created: 2020-12-16 04:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b62b72e93afa7e330abb271d5ecaf3e SHA-1: d1b6b2d4909e5f2f221c8c52e616bccad5cf9b21 SHA-256: 88e8d1c2073b8c2f4751e10e2dc80142492d6274529f31d4256c2fdddaef5d5c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or phishing campaign. The ClamAV detection and ML classifier also strongly indicate maliciousness. The primary external URI, 'https://trafffe.ru/aws?utm_term=violin+sheet+music+greensleeves', is likely the intended destination for the user, potentially leading to further malicious content or credential harvesting.

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://trafffe.ru/aws?utm_term=violin+sheet+music+greensleeves PDF link annotation
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/303876.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/sozidedefuzex.pdfIn PDF document text
    • https://joxiwawetesamiv.weebly.com/uploads/1/3/4/3/134306419/wuveda.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/db25fc387.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/pigiwojoma.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/baritexovopa/chloroplast_and_mitochondria_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/budismo_tibetano_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/barcode_scan_android_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df3fbc5-6170-4e6a-a627-96e194bad3e4/64236332504.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/agnathan_fish_information.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/j_brand_jeans_size_guide_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58d319698b02c7f403fdb/t/5fd0cd2f5c296e7a687da649/1607519536088/46569084229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b255d59-1548-4d80-8104-4b6d91c3a966/fakuluwazumilesumepeji.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_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 4908 bytes
SHA-256: f84f17c65e423de330fd26adc62428f88b43091ec7942449cf7286e489e2caec
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 11148 bytes
SHA-256: bbf0616ee1146a3d8658fe83ac14b3daa3cd72594c3681d95b10a3730202f144
font_02_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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