Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19bf95abf69ed23…

MALICIOUS

PDF

67.5 KB Created: 2021-03-14 06:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49bb24e3e33540ae823a77c5abbf059d SHA-1: c4deb9f45215f71f819e5ba5129aa62686e2cfea SHA-256: b19bf95abf69ed23d415f21e42279aa2d3308d94367be270a8fd125f008ac14e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are commonly used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://pelibifir.ru/wix?keyword=negative+contractions+worksheet+pdf PDF link annotation
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/danozo_linikakebev.pdfIn PDF document text
    • https://sizemerekev.weebly.com/uploads/1/3/1/6/131606963/5705331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_6042e8c3422c7.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/diabetic_foot_powerpoint_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414873/normal_5febe2b082fc3.pdfIn PDF document text
    • http://vuxijagodoku.22web.org/duzesa.pdfIn PDF document text
    • http://meetsucre.pro/frigidaire_-_50-pint_capacity_dehumidifier_-_whiterhxr9.pdfIn PDF document text
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/mipofe-zedozifosuni.pdfIn PDF document text
    • http://poverkavoda.website/wiwemasifelaritxr4f.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/kopplen_z3_case_manual2o46a.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/8f42744cb0632d5.pdfIn PDF document text
    • http://wixiziz.iblogger.org/insurgent_dual_audio_300mb_movie.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/6f1759b777a35.pdfIn PDF document text
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/3dcee845e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5fdc77f12a2a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasaraba.epizy.com/17116221176.pdfIn PDF document text
    • http://kezakodik.rf.gd/kotejojovonebop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387f4a27-5dce-4fb5-a65e-4a1dbb304469/used_minn_kota_talon_15_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc739509-51a3-4449-9cd0-1b8df70c53fb/what_is_the_order_of_the_throne.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_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 5572 bytes
SHA-256: 0987c0eb3a0020898caa81553d00f2d52ccc49200ef4cfdde74b9dd11d61db5d
font_01_sfnt_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10100 bytes
SHA-256: 5fb6901f5635b1f457237ce0df86661bc5f0cee7eca8173d939a79b40bbb4990

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