Malicious PDF — malware analysis report

Static analysis result for SHA-256 816a9d7b7a958cb1…

MALICIOUS

PDF

68.9 KB Created: 2020-12-18 09:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f34ab33ebe04d4e1784692323585f7d6 SHA-1: 7b329ed745377a68f9eb269c0a935f172448beca SHA-256: 816a9d7b7a958cb18eba70cfd55cfd2bf016d53fa23f1c8ca6cee23963da40a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise.

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://trafftec.ru/123?utm_term=indesign+word+count+script PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417305/normal_5fba2999ea1e3.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/kilate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f9cd4de2c9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5fdbe12cd72bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5fbc7a47cddb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc11fbabe9b6939510c2240/t/5fcd9f2d0ab5d62feb0e2f81/1607311150087/vulizoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d01f5d5-588c-4db2-8305-0fad1467e8a2/40677512522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dfad8ac-f0d3-4053-99ff-d99c28d0ebee/2269126266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbaa667f-1517-45b3-8da8-51bece409c56/dotonogajobubejerubu.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/4688092685.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/misez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc55042-eef3-4377-8c10-f10e50d4e16a/minecraft_apk_new_version_2016.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 5028 bytes
SHA-256: 64015d86a6520955c4b25efe552e14a1589295d2609fcc05deb632e708db6170
font_01_sfnt_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 10988 bytes
SHA-256: ccdc3f9679c7e569d54f1717ce29dc886db4fe4363526cb69b09df8f8223f9e1

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