Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2186a82ba9f0fa…

MALICIOUS

PDF

68.0 KB Created: 2020-11-13 03:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c7af4d89b219a93011698f5e404c3c63 SHA-1: 23bcd9ee99c8df4aedabc86ca62648a3060df371 SHA-256: 5b2186a82ba9f0fa35db493b446ec49a355a54a44d249b5e050d419a26e9ceed
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external links, with a critical heuristic identifying a PDF link farm. The primary malicious URL observed is traffset.ru, which is likely used to redirect users to further malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=it+was+a+bright+cold+day+in+april+meaning PDF link annotation
    • https://pimedoxeniku.weebly.com/uploads/1/3/4/6/134640330/tikalesarewupu-funibajusux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5fa0f2bdcc55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5f95cf8a68bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_5fa2db2a88502.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/d2c7d3d.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f88b6fc2da37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5fad9c6dc635f.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/3e16f30c-28a0-4c95-a6ee-abf01676c869/mutant_chronicles_rpg_character_gene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0b4f9e-8369-4654-ac8e-888b62b4a7f9/att_center_concert_seating_chart_with_rows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d77724-5996-4faf-967f-3c9b8ce64df1/30855776314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b88266-0f27-48f6-9d91-48bb696e79d8/wot_server_down.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_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 5756 bytes
SHA-256: 9ed816df335d6e5bfb7e107091baef33cbac5b545e89cbbe8ed0861066cbec22
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10652 bytes
SHA-256: 8dbf1c4d929746821ba0f822bb526c984c8cc5507f08cba9c74d00dd95dc5cb5

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