Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d3aa5f7674c4f7…

MALICIOUS

PDF

74.3 KB Created: 2021-10-08 07:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08a6813ada99835713b1c197794e859f SHA-1: 37a94e3ce33f356f35815e5cda9b9aa2906ec9b4 SHA-256: 10d3aa5f7674c4f7c3c0a5f958a5686c8af486a54efbbdfcafe243ae1e4e8330
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ae286b72ad---29134328604.pdf In PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/tobefewinorinezise.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/korimupeguwawemebubeviwan.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/7848124981.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219252245128585.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/56396425211.pdfIn PDF document text
    • https://senegal4d.com/contents/files/4452881034.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/96070048140.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/masemimupereg.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/xiguvavafizej.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/245c77f77368643692edd3cdceaceeb4/73633468192.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/82486252383.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/galumeguwevogi.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/nuwimejuwikujovodegi.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rigiluxegu.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/dotetuwipimoxadiluzit.pdfIn PDF document text
    • https://sanidom.pl/img/file/23773627509.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/domawagigexerasifegara.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109241720316094.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/75657089257.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/fitirexu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/11708951051.pdfIn PDF document text
    • http://zaiger.ru/img/file/zagunesekafefoso.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210909200444.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///vewegurobusajuwuketuveso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=request+for+credit+terms+letter+samplePDF 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_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 16580 bytes
SHA-256: 70cf5403a19e13d687e8d1e6e560fef9c8891613b1905312321119b950cc461b
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 10968 bytes
SHA-256: 860fee83e4511cba190ba7518edd5cbe1d6472b01c62afe3c4eea5142fbf7181
font_02_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1