Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc09c16c0bec338…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 20:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1031634dd959805ee19f20f97eb6fde5 SHA-1: b2899fe551a09c6176fe37617fc6601dd20d1f6d SHA-256: abc09c16c0bec3387ef3474f1a0fba9991fe7d89f7092cbd053b182c23432c11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to unknown domains, and one heuristic specifically flags it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://conexkarvan.com/cache/fck_files/file/pomisifedizuratagavoduger.pdf In PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/56469004466.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/99457142658.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/mojaxupozozuko.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/97346812240.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/lafekimuzusoliwadil.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jovolasamomulavuzag.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/55192759241.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/92925277723.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gujax.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ar7a7ucnjqm5ud0u5i61jjt98c/vumafudutodipixerure.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/7755053403.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/gefimufegajog.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/weramuk.pdfIn PDF document text
    • https://dm288.rs/slicice/file/82477221014.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912000854298219.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/17218286837.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/7935169108.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/8582053269.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/9285213709.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sobomuxinimijenaden.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/10746085887.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/borexawum.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/59232535279.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/bituzekapog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=web+browser+for+android+tv+apk+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 15868 bytes
SHA-256: 3d36662e754fed71c1207b3b3d7bc57f7bf1ce1275e194a1ae7c709c396c584b
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10868 bytes
SHA-256: fff930dd087cf00f7a813b66c09a11418151c8200f25b2d6233199afe5a7f7bf