Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cc6970bce5f06d…

MALICIOUS

PDF

72.3 KB Created: 2020-11-18 21:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: af93670d2b6e48232ea00c668b88ab30 SHA-1: 2d505c8c8ed92cba1e51dc17acf01baa816a3f4b SHA-256: 99cc6970bce5f06ddc6f63bcebcf696f8be1fde9462e30ee24ca79899f5e5903
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to obscure the ultimate destination. One of the extracted URLs, 'https://trafftec.ru/123?utm_term=ap+statistics+2017', is directly associated with the malicious activity. No scripts were extracted, but the PDF structure and URL patterns indicate a phishing or malware distribution attempt.

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 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://trafftec.ru/123?utm_term=ap+statistics+2017 PDF link annotation
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/2484142.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://gofasajuv.weebly.com/uploads/1/3/4/3/134359632/3763619.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/vipunaxokoni_guxojudixewa_gazaxovolegeb_jumemex.pdfIn PDF document text
    • https://kesolijizik.weebly.com/uploads/1/3/4/2/134265964/ab664924492036b.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/373225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f8cb6216b656.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/3b12b7.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/geropuzonivuvej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb11524e-ada0-4456-9ad2-9dfd8ea842e4/kinugaxemovikodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a52572-94bc-444d-9ff3-176efcfd923d/ganapati_atharvashirsha_in_kannada_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 5196 bytes
SHA-256: 51ec54e45362c6444e825e245cb306f012c74d39c73a12cbacd0df02c4d1b038
font_01_sfnt_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 10816 bytes
SHA-256: b9aae1d5e4a0d1c1294d1dd219b2354b4ffc9489831adbae12165ee040e344f0
font_02_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 16304 bytes
SHA-256: f5bb76669e7554da1b5a40c68e128d3a07e6504965917e7558c2ad61997b0db0

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