Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f94dde07e7b72fe…

MALICIOUS

PDF

68.1 KB Created: 2021-09-13 04:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70f278a8d5bc8f98687fe2491e185884 SHA-1: 8e7daf26dbc82dd1d2baad274f2923815b0c7f3b SHA-256: 9f94dde07e7b72fe5ce2c1bea85e7e76c38922cea8d8c80978447a9de2f9234f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.novosib-sport.ru/ckfinder/userfiles/files/32738993389.pdf In PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/5508783950.pdfIn PDF document text
    • https://rintrans.com/files/lepusaf.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136817c5667f---76911772322.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/pegizovarufeku.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/finifurodabexirozid.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/12686532766.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/12892197286.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/begutikatumudoganafu.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/30347745461.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/24494569336.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/gurejonizezagal.pdfIn PDF document text
    • http://secretinvitation.net/images/files/10116095137.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/pedujizenamamabuvoxo.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/86150309314.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c14e6098899b94a563e58fd67a556e5e/92013568616.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/83667737092.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7837969423.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/52832761118.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210901212117.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nugitat.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/21499599994.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zawazawujezomagibuxuz.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/rupab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=movie+joe+dirt+castPDF 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_off0000af0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0D 10404 bytes
SHA-256: 20a50dec33b880b868c76e5834f3be5fa83090fce037193557fe5d568e02d577
font_01_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 14548 bytes
SHA-256: 87ff8bbff105b4dfaa37c7d179bf6928aded1b618fada78ab01c6ec7ebc66b40