Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f02c7afc94f80e…

MALICIOUS

PDF

73.8 KB Created: 2021-02-28 20:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 28c50a51ebed42bd75574c7c7ff8bf6a SHA-1: bfe453e8b5a263058d8d2b291a41594529693c40 SHA-256: 24f02c7afc94f80ed5b86220e44020ab2ad6aba25779b01b539c50f837f79f59
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of outbound links designed to manipulate search engine results or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=how+to+repair+inverter+air+conditioner PDF link annotation
    • http://luchdobro.site/tetipib2zq.pdfIn PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/870d94d3.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/tejiburinimova_zitanusavanepi_besiweda.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/nixowu_bekefidiwuxumi_sovene_kazike.pdfIn PDF document text
    • https://pikimitif.weebly.com/uploads/1/3/3/9/133997727/xinopepune.pdfIn PDF document text
    • https://jotafeke.weebly.com/uploads/1/3/4/0/134096025/guxasemugo_resusogekikeka_kafukajobuvalo.pdfIn PDF document text
    • http://kiguvogig.iblogger.org/rinelup.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/fugili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ff2b4847d128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijinisefiregot.rf.gd/steam_link_android_tv_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/71473521914.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/94463492436.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/56431463924.pdfIn PDF document text
    • http://jozubukobuwaju.epizy.com/four_eyed_turtle_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/yamaha_mg24_14fx_recording.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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 4968 bytes
SHA-256: ce9f4bb46d3e0d540dbb478a3210fc60e7ecb9df70d919674277f0527df59e44
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 10480 bytes
SHA-256: 2226a50f862fe2f59db1da0aa04b4e268d34334f23b3dd4cf2fc323240a9af87

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