Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba748b8f4ea2b1f…

MALICIOUS

PDF

75.5 KB Created: 2021-03-26 15:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 441e4575973f43b9202c7c00795350b4 SHA-1: b0f1bd3fb3d557b9f459007eb4f6e30f4ec7a19a SHA-256: cba748b8f4ea2b1f9816f10c0c3cec573ff3cf874a487d73b79a50bdec48701b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it functions as a link farm, likely designed to redirect users to malicious content.

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 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://jumiwimov.ru/123?utm_term=lovely+noor+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381740/normal_60358c219a5c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fefd4394d449.pdfIn PDF document text
    • http://helper-badges.com/94643647739rec7g.pdfIn PDF document text
    • http://choosemadam.site/how_to_convert_degree_to_radian_in_casio_scientific_calculatorv046m.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/ihegeC7/rawukizorapowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd12c35663f5.pdfIn PDF document text
    • http://copyrightviolationcenters.com/acer_chromebook_15_review_youtube2my80.pdfIn PDF document text
    • http://nasporte1.fun/pelicula_mar_adentro_completa038c9.pdfIn PDF document text
    • http://blockingscenery.com/wumamipugedunojagenukirivc9n48.pdfIn PDF document text
    • http://matteset-spon.space/how_to_reset_your_gopro_hero_3_wifi_passwordbjfjz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_601d31fa4c97e.pdfIn PDF document text
    • https://cdn.sqhk.co/fejipotegevi/m8jiuid/27029785538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491148/normal_5fccabb741515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_86021e14034246d8a5fd3ead954bbbe6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c8f41f-6bc3-4f63-92e0-24dbdad40ae4/fenevawosili.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_0356b6c38a3c4aeda1ce697c48de179f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77523b12-3c51-491d-804b-0ffab3618def/how_to_troubleshoot_an_air_conditioner_compressor.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_93cc125e9ae7432f81ca0230ca316680.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc6bb46-828d-467f-b83a-72bc0fbd72a2/15608904985.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 4748 bytes
SHA-256: 032fb48758ecb0b0814a03fc2f80ff3644a562b61902bfebd4369ce4a959dfc5
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 11612 bytes
SHA-256: 63533ffbc750a4921c0b568332c042fa0f2906a89531dab320dec70a603d8a00

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