Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7430a21caf1f85…

MALICIOUS

PDF

70.7 KB Created: 2020-12-10 16:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 90c486769472feedc2ead3883524a1bf SHA-1: d870986eb1520abab53244f8ec8ad23e5e509396 SHA-256: 3a7430a21caf1f85764fa2c333057a75ab5c6a01730d303f074e63e738c7d9ee
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/aws?utm_term=cause+and+effect+diagram+software+free PDF link annotation
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/dacaa52221d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5fcd1620bed76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f93507018596.pdfIn PDF document text
    • https://jofuwutiduf.weebly.com/uploads/1/3/4/7/134728528/xosojolofinamifija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409396/normal_5fcb1632697f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5fc12be352ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5f980719bc695.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
    • https://s3.amazonaws.com/fatisake/ezviz_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8001a4b7-ea07-4696-af74-dae7108a8964/bevijepotarutotosifutoles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e365755a-c4f5-478c-bc16-ccaacd96d48c/44192581191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c79612-7d0e-4822-9aac-35fc7082789a/fozatavamesixipezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fc5157-5c8f-44b1-aa3e-6ceee3a4aa0d/i_guy_1_screwdriver_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97df10-25c8-45ce-ab18-4d0011272726/kakedikogazijivanamibuxis.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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 5308 bytes
SHA-256: c2b039f2622570966b9ac1cb83a678fa3cc61d177d781e614ff54faa16d901d0
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10596 bytes
SHA-256: 0e06c64d2fd658ec5a8a1f62c580fa9eb3a9132c9bfcfe449e432aac3e8cc06c
font_02_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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