Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7ac80ca2e54fd8…

MALICIOUS

PDF

69.9 KB Created: 2021-01-05 21:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 612ef70a005e7633dbe02f140abc7fa2 SHA-1: ec837770f82bb48dfc9333d2ab8b01b62dcc4cdd SHA-256: 8b7ac80ca2e54fd80f62cfb40efb93d8c987ef59e36916cf271373fba38d71bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains an embedded URI pointing to 'traffnew.ru', which is likely a phishing or malware distribution site. The PDF structure also suggests a link farm, with numerous external PDF links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/aws?utm_term=balance+sheet+cash+flow+income+statement+relationship PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8cbdd06a2ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5fd8f12977179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5fc6729bab09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f91f1904f4ae.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/pakep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/028f474f-b91f-4a97-a99c-3d00a5006f7e/gafumanesareke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99cc565-bcd4-4055-8b4b-0aac04fa213d/25467958665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5e4232-e5af-4d21-b463-4112d7dff648/65193910762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81fd5d4-e07a-4953-88c8-6a3f54403533/lion_beaver_otter_golden_retriever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75eee222-ed9e-4fe7-a205-3f568bc46e69/47286515565.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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 5396 bytes
SHA-256: 491253b15fcc85b3c95173a374bb0dacf778ee9eae01a20bd72701f022c2cc0b
font_01_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10300 bytes
SHA-256: 1b8f9f3e4638863a5b6d849481e849f75916ba5e0c8ac2af6463cc27ecb9c639