Malicious PDF — malware analysis report

Static analysis result for SHA-256 9857b4d87220c89f…

MALICIOUS

PDF

91.9 KB Created: 2021-01-22 06:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 52290a4ccf77f15213593eb57dc13646 SHA-1: c328362972fe35ea0d35b956047f4751141ca480 SHA-256: 9857b4d87220c89fd98894e1da4f40c24b34fed426e188ac042b07a09cfcf1be
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to unrelated domains, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

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
  • 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=deepwater+horizon+oil+spill+investigation+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fefc7511d6de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fce857f6a199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379987/normal_5ff58c4f00c86.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/4304117.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/pugfttR/black_men_s_haircuts_with_dreads.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/vozomugogipejuk.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/636440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_5fe371325e3f5.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/UjgHrGv/freedom_mortgage_refinance_options.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/jjj0Fhg/relaxing_music_collection_download_naa_songs.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
    • http://banidokote.epizy.com/85249234189.pdfIn PDF document text
    • http://gamovomubapo.rf.gd/cdca_manual_dental_hygiene.pdfIn PDF document text
    • http://malinaliwul.epizy.com/mathematics_for_machine_learning.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/86906193387.pdfIn PDF document text
    • http://marobow.epizy.com/ravemamudu.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_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 5072 bytes
SHA-256: 70389441f50b844e53569ddd0f566587483b62b92f12721111407eb8ed24b655
font_01_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 10948 bytes
SHA-256: 29d736e642e7a286897a71f1299e5846833eeca5b06035e0d277656d45c0040a
font_02_sfnt_off00015412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15412 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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