Malicious PDF — malware analysis report

Static analysis result for SHA-256 b998a1c0bf55422f…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 14:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 539c3a0a78cde6989e180d9497760a81 SHA-1: f2ec9efb5e44cc7dead6e06e003e752f39e7cb20 SHA-256: b998a1c0bf55422f977467c765ec938905c1091df5734466f73f2fd5c4dd6ce6
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://baarspo.ru/strik?utm_term=is+software+testing+a+good+career+choice PDF link annotation
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/kovelapewirekanuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fd2dd87a6aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_6031b2a580f78.pdfIn PDF document text
    • http://berozava.iblogger.org/aimovig_drug_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fcce965d8e59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5ff0eefe63771.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/ijafihc/2020_ford_raptor_truck_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/Hgpqjam/transmission_shops_close_to_me.pdfIn PDF document text
    • http://glawerry.online/59134061371rs921.pdfIn PDF document text
    • http://migazezi.iblogger.org/texesubunikubofev.pdfIn PDF document text
    • http://sumidabitax.iblogger.org/vemajug.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/F1jgzia/glow_hockey_2_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/gfDjf0W/galaxy_watch_3_bands_20mm.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://tadidemoribezor.epizy.com/cradlepoint_ibr600b_setup.pdfIn PDF document text
    • http://fikovik.epizy.com/bowafan.pdfIn PDF document text
    • http://xafinoligu.epizy.com/telixozufakipuk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 5068 bytes
SHA-256: d06f91fd373d9af2769a424de08fc7a5a7b9d9a3bcdf8b26a2d86c9dd05beaba
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 10744 bytes
SHA-256: b20a3c1489f85fea0397161ba4f901f8ecf6d8496e39343ecca47cc6b2a749d7
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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