Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea77d6a316aa5c0…

MALICIOUS

PDF

72.4 KB Created: 2020-12-22 05:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c73e3100f3e2171fc81c74aa4f447434 SHA-1: ebdeb2b563b6c639c4a85eaddd36c3afb27b1180 SHA-256: 6ea77d6a316aa5c0898279314c3f34281b352aad675c59b7aff1f51ab38e47d2
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 point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://trafffe.ru/aws?utm_term=binary+ionic+and+covalent+compounds+worksheet' is a primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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/aws?utm_term=binary+ionic+and+covalent+compounds+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5fb97cceaad5f.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/balirur.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/4842263.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/dugibabafod/39314007897.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/wb_hasnabad_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/kiwanilikawizagoxozop.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/pupopenosife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d581dac-4002-4554-b0ee-b23c32fc51ce/gixawoluzuvivefex.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_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 5564 bytes
SHA-256: 813782bfd962e511073cf0debf15875995dbdd304086dceb1ebceb0bca1e76f4
font_01_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 10752 bytes
SHA-256: 9f033022f80b1ca5fb298cb2e80b9f14149173930036326a6144dd8fb0aac437
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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