Malicious PDF — malware analysis report

Static analysis result for SHA-256 6732b803cfd6d8bd…

MALICIOUS

PDF

80.9 KB Created: 2020-12-19 14:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 07c97c8f8bac822e84f1df6cf710ed19 SHA-1: 783762b35188543684f4bf360a38c8b266c2d830 SHA-256: 6732b803cfd6d8bd7f9c5d166230e72923cb16ff57c1f6ccfb7b50771d031c5f
156 Risk Score

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 point to potentially malicious or SEO-farmed content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file. The document body, though heavily obfuscated, suggests a lure related to 'analyzing data on tuskless elephants worksheet', which is likely a pretext to drive traffic to the linked sites.

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://traffset.ru/aws?utm_term=analyzing+data+on+tuskless+elephants+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455669/normal_5fa49113396ee.pdfIn PDF document text
    • https://wapixetisabin.weebly.com/uploads/1/3/4/6/134685373/198219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f922fd116b8a.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/zeworibuzoza/naxazez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb86d577-cda9-4f95-adc4-ee22354b02c4/24330886665.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/4272292953.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5540f16f6d44b07dbf651/t/5fca003185627875175ffa3e/1607073842743/podot.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc554c4116eb00e3c69664b/t/5fc6d83a6beae454315449a7/1606867002973/95313070113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761b112d-31e9-431e-ae04-f6085ac94cf9/43023083103.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/9106804777.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/10713846440.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/html5_responsive_timeline_template.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_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 5520 bytes
SHA-256: 0f8ca0b38832d4815e0a1b9d92a25c703c77cea0cd65c1d51721fa00a17f8b9a
font_01_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 11276 bytes
SHA-256: fbbef60ee08fc4b2a88d8c4ff9b0c57d651166c2492555872cc221e5701285b1

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