Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4da6cc3d81f2261…

MALICIOUS

PDF

69.2 KB Created: 2021-02-11 00:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c535d98d16b7eaa3a6902aaab1eabc10 SHA-1: f8346e456075be75ff6cb91ea8679c95f8eb0764 SHA-256: a4da6cc3d81f22616a4fab4cb635b54e7bb13037248c27a3cf60253dd6692c6d
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=lady+macbeth+sleepwalking+scene+explained PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5ffa9e22b891b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_6012085662d39.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/1351616.pdfIn PDF document text
    • https://mitebisaxu.weebly.com/uploads/1/3/5/3/135395238/vawebikoz.pdfIn PDF document text
    • http://all-host.site/rejizipadagefikobawa6tp6l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465702/normal_5fe145fc1e9ac.pdfIn PDF document text
    • https://xefewovureku.weebly.com/uploads/1/3/4/2/134265706/6693774.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/dewavaliradelakive.pdfIn PDF document text
    • http://frontglass.xyz/sql_server_2012_standard_32_bitx6uah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416660/normal_5fff1a86cf983.pdfIn PDF document text
    • http://micrometerdigital.xyz/66503977242ztgh9.pdfIn PDF document text
    • http://mangalvpodarok.ru/rolling_stone_500_greatest_songsfk0sn.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/zetubakuz/7561856032.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/65230377934.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/976416182.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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 5800 bytes
SHA-256: dcd5149925ee6307ebb6e50cca93f5e1445ae8f35d460051191822d69974bf56
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 10444 bytes
SHA-256: 131b123818f5a5858cb2674bce396217ecbcf0d81694b65c4b872d798d7eedfc

Open this report in the interactive analyzer, or submit your own file for analysis.