Malicious PDF — malware analysis report

Static analysis result for SHA-256 647d4ed31a17c283…

MALICIOUS

PDF

71.3 KB Created: 2021-01-06 13:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 33c8d3544ecc11824add3b0a0269cc34 SHA-1: 7141c95f16d0ad4866718b4e9ec56b38553daa78 SHA-256: 647d4ed31a17c2831bc9bb68c8cab4b492472b8ff7625ba7c984b558dbb8aba2
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a mass of external PDF links. One of these links, 'https://traffking.ru/aws?utm_term=create+data+entry+sheet+in+excel', is identified as a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=create+data+entry+sheet+in+excel In PDF document text
    • https://xosuloduviz.weebly.com/uploads/1/3/4/8/134890731/4987621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_5fbf499d707ba.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/redurojimasof_gapogiwebakubu_betewibid_guvit.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/ZGwx1rB/disney_store_coupons_august_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ff26177d6807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5fcf44292f01a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fed4406f3215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5f92009c596d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fdd5d23141ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fdeb46e9eacc.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/sakaburepagase/wulafipetexar.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/5182658237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7c33ae-4f2a-4e2b-bd39-764d56f100ac/29683398990.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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 5104 bytes
SHA-256: 80f723fe5d1ac8087ed321eb1ed2df5474d9ef913345bd99f93fcec0f3ce70ac
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 10632 bytes
SHA-256: 2c88cf2b35d8a8696158024c75b935d4d153b2703ca6ecfcffac53df87233cf8

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