Malicious PDF — malware analysis report

Static analysis result for SHA-256 d159aaa577f70982…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 15:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4686484acd5b388e8c44141f432eb31 SHA-1: 77f7fd518bdbd6e4016ed5b7ff91a17aa1bb96c8 SHA-256: d159aaa577f709826433526318837a197530973ffa1a757d14abe995e079abb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and external URIs pointing to suspicious domains, suggesting it's designed to exploit vulnerabilities or redirect users to phishing sites. The presence of numerous links on disposable hosting further supports a link-farming or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=run+android+setup+wizard+manually PDF link annotation
    • https://vinatech.com/userfiles/file/nukirigolepijenuvigo.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/62240693650.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131938ae255d---bekegiwajeg.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/87299898604.pdfIn PDF document text
    • http://mp-journal.com/media/file/14348977778.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/bikokudugejelomopevosodo.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/43484043096.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210912115700625507.pdfIn PDF document text
    • http://davcpundri.com/css/file/vubizazobopiwafes.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/damimakaziwakebetuveta.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/wiveseveju.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69684621869.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/72991251775.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/12167558614.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f0cb47af0---7163204618.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/kibapidozagi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/bavudisevotoruxosevo.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/30057183789.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/49034451098.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904235847406320.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/dafenetulenisonis.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14768081589.pdfIn PDF document text
    • https://ebooksweb.net/files/file/679744002.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/28456131994.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/wujaru.pdfIn PDF document text
    • https://bor-diing.com/upload/files/toxopajoze.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://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_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 10956 bytes
SHA-256: 99d3fc54e99d49f1e9c8f00afc00a33100c093878f62efdcd0a8241fa1133c90
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 17048 bytes
SHA-256: ca5aaa6734a65bb2dbd067ff83f47e653a68853043bdcaebfedb6000f7029c2c