Malicious PDF — malware analysis report

Static analysis result for SHA-256 25653ef2cdb1f650…

MALICIOUS

PDF

89.6 KB Created: 2021-03-18 18:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fa1b9524eabed71ad91eabad618ace2e SHA-1: 829cb70f6633f67e8e014dc85598249263506bb7 SHA-256: 25653ef2cdb1f6503f885947ef52c6173bce514ac2505e1dc4855bbc16002ba8
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://kuzutuzo.ru/award?keyword=principles+of+adaptive+optics+tyson+pdf PDF link annotation
    • http://forumapu.iblogger.org/certbot_manual_wildcard.pdfIn PDF document text
    • https://xisofufewazexi.weebly.com/uploads/1/3/0/7/130776718/accd2d411.pdfIn PDF document text
    • https://lawanirixuxevu.weebly.com/uploads/1/3/4/4/134444287/1712296.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/7371378.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/xivarivepusoruma.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/5002505.pdfIn PDF document text
    • http://potoborotagivud.22web.org/best_humidifier_for_bedroom_2018_consumer_reports.pdfIn PDF document text
    • http://wupozigujoruzar.22web.org/tifofijugaluparaxobanu.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/jelimexigifu-dujerekedijemi-tatiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lediwetopoj.rf.gd/59679857503.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_d402f7cf75844342bf301c26a68a0949.pdf?index=trueIn PDF document text
    • http://tezotidugo.epizy.com/money_banking_and_finance_book.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_bd9eb97750ff4a49b48e1ac14b99d911.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_45224c3181ac446db3c0161db120b36b.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_4e86234d343f431fb652c40a5eda0bee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2053cc3e-88bc-4c1f-ad08-ec465487fd52/76425358715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d419cbf2-d2c1-4a1b-82e5-c2899e99ce60/what_does_the_song_take_me_home_mean.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_8cf0c620c87d454794e578c425aa29fd.pdf?index=trueIn PDF document text
    • http://rasifufolugewep.epizy.com/el_espejo_enterrado_english.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_9c6cbb9bd08b488d8829f5f2b21dcd57.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_83193d291d7e4e5abc4096b57b6fe673.pdf?index=trueIn PDF document text
    • http://meganajaxovitag.rf.gd/capezio_australia_size_guide.pdfIn PDF document text
    • http://tavapoz.rf.gd/jimopuzilemelurobili.pdfIn PDF document text
    • https://143c7e3e-1a56-4739-9c24-5aac26b0263b.filesusr.com/ugd/28d7c1_7a228dd3b4b845c3bab993bc54b97169.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 23340 bytes
SHA-256: f8adfa1107498c580d3a63cd890be8b9e71d5dcaaa3d6c2a143f332bb7104a8f
font_01_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 5312 bytes
SHA-256: 5024fa3aa47b490cfa4ed066a3e26b9b81e69bf141ab83e344e358830466fe6c
font_02_sfnt_off000133d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 10156 bytes
SHA-256: 22d8e03e55422187089759588c510d5f69209a11e6a505e2fe6bf8f9cb730c67

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