Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd5855e4d544625…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 03:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b2097ae7cdc940dd7090179b667727a SHA-1: e47ab11c575012933ccd6e4ffa4ceab43a978617 SHA-256: ddd5855e4d5446256b1d1c8e13a92d702faf3dd397b08fd3e8d2e726ffa3f951
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of numerous external URIs, many pointing to PDF files on distinct domains, suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://idealist.ro/userfiles/file/lomoli.pdf In PDF document text
    • https://bongkartuantakur.com/contents/files/40510710869.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/zawolow.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142484062232---96901975927.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xovidelejiripa.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/51163417140.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/kemegemipixenowutofower.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/ronavo.pdfIn PDF document text
    • https://pellevah.com/upload/files/53852863333.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/83739367408.pdfIn PDF document text
    • http://byecook.com/ckupload/files/34324610329.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905062941.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/53578206376.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/tuzidamonolufasobom.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/delakipuneraruzugavoboj.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/22969086281.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/81379588648.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fisolelezo.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/67593673061.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/71075882437.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614e57b3b212d---50867724218.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/zanebokuma.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/lixivakinavakufipo.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/zewaxivowem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+gps+hack+pokemon+goPDF 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_off0000b10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 16316 bytes
SHA-256: 2605cef543fbdafa53020e4b701458f9008e77fa0b37fb33d5b8d1c0cae6ae99
font_01_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10752 bytes
SHA-256: 1ac1719e5862f56bbaf892d628352c54696b3d30af29df8b91df2d05c3fc397d

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