Malicious PDF — malware analysis report

Static analysis result for SHA-256 630a1cf5e054a226…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 08:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f2be3d6b152a39a5492b6a3e73fba2e7 SHA-1: ac2df0ad5d957a72902857d43c85bb4693bbf3b8 SHA-256: 630a1cf5e054a226d25568107b024c7ed33e128c86334fb29f1a467a8c9338f9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as file downloads and utilize UTM parameters, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or the delivery of a secondary payload. The file's structure and numerous links align with techniques used to lure users into clicking malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=football+manager+2020+apk+obb PDF link annotation
    • http://www.nbc.com.vn/ckfinder/userfiles/files/pozizevewaromebojavemumev.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/63026295508.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/46046369605.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/zobijogonata.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/59344840364.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5266d501c---89736321853.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/wipowodotuzenewerom.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/kuxisaso.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/totewufam.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/kovijetivotifukebiwed.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/pidutizaponezi.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/menizabisejiko.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/3532840325.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/rokug.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de23fd1c6d---12010753662.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/48056178333.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/50497632373.pdfIn PDF document text
    • https://pisausakti.com/contents/files/jemogalerufabuzet.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/66035501652.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/28937429472.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109212115232598.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/feluxudumuka.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_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 10784 bytes
SHA-256: a93c8c04dd76e02e690f57bd9a77b601ef148d94179340eff9fa7142485e5f40
font_01_sfnt_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 16240 bytes
SHA-256: a27dd6c82e751e980c01d5e4f3e56d0ec021e74c9b5529101967ced0c4c3fcbc