Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee52970736cc2da…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 00:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5561f3a194cf74fecdff4fc075966d8 SHA-1: 8236befc1fa7ad523ece6833b7aadfa9a5d6f049 SHA-256: eee52970736cc2da8fdfc95f162bcec2d5c180eca14163e2b86cc6f3fdd33f15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous external links, many pointing to PDF files on unknown domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into downloading further stages.

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 http://pegastelco.com/pictures/files/nalixat.pdf In PDF document text
    • http://jtg-antracyt.pl/files/file/61134666512.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/japinow.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109012007389381571pdkrfgts5f5.pdfIn PDF document text
    • http://annabarons.lv/files/files/derokurif.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/9328900084.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/33111164883.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/27781471972.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/2526109551.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/fatolagujexawos.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/tujav.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/28388989222.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210909001217.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f077857bb6---redaluwotajanozepajimuko.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210909024243100.pdfIn PDF document text
    • https://ewt.cz/res/file/kavodoporijolosekonul.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f9a5a639b26791b603ff4fbe98ea80f7/3390031202.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/54125003926.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210902121109.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/juwowowusapu.pdfIn PDF document text
    • https://razredna-nastava.net/files/tawik.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/zuwitizosexapilexizunok.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/5469620207.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/64544932914.pdfIn PDF document text
    • http://spharma.ua/files/file/nuwovamepovatilot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+kissing+booth+2018+moviePDF 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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 11008 bytes
SHA-256: 7d1fe2348414b92b42f9970e4487b8ee93c87af6bdfbf2042a453be57c58f74e
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 18304 bytes
SHA-256: 38ee710e4b6c5d338d042f2eb5d2fdd88b269e0bc834deaba0d2b9a512f9fb52
font_02_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1