Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38e83054a040aba…

MALICIOUS

PDF

74.3 KB Created: 2021-02-17 01:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 12890dc1ff535eaa7e522ae999a254da SHA-1: 35a227f7f15e1f01478fced9fa06a74f40ca0bbb SHA-256: b38e83054a040abac800a3107596a06c2c0b3db2ac1ed3af7e8d30b2becd40a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-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://maypoin.ru/aws?utm_term=the+planting+of+english+america+outline PDF link annotation
    • http://usesoda.pro/13963900994h223.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/apk_file_minimizer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_601f3ac327b63.pdfIn PDF document text
    • http://songkfrk.site/dagevofomuledemgytu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456369/normal_6000f3d4c314f.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/Iidqghe/our_solar_system_consists_of_mastering_astronomy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd61353e85ad.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/haEjjjg/55966772787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417222/normal_5fc6c755c6677.pdfIn PDF document text
    • http://ontrade.top/71041631537fg6b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamiwuvobazom.rf.gd/ruwuraretanuzagera.pdfIn PDF document text
    • http://lubuzasoxevixan.epizy.com/epithelial_tissue_types_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/93957249187.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/menobolovazavate.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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 5380 bytes
SHA-256: 2b6ac304b582553fc0e758f95695fa6c387764a54156cbcea331708bfa343264
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10196 bytes
SHA-256: ddd8b8444e3ad38a746333e4359ef404e9af9982e2556866c1da75d53d9e82de

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