Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32d6ea7a3b552e5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-11 09:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2e568912aa5720eb765fa2e563decfa1 SHA-1: 4cb03c87fa171cfb00e99abe24921353e60f9def SHA-256: a32d6ea7a3b552e5f59a7ec9e0b4a27b634f8159e11e95ad6301810d52025887
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=escape+plan+tv+series PDF link annotation
    • http://www.medicellbank.com/userfiles/files/xanam.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/weteme.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161316881396ce---16608370434.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tidubir.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/33608402163.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/wefadonavimibo.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rigomuvelul.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_205244.pdfIn PDF document text
    • https://mimpidia.com/contents/files/ruridabuwozozopifuwedegi.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/32425910362.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/31355112330.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/jojafukimakojaz.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/58905115324.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/tewokurigaxetuxi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/151293d5d253fbc07b9abfcd0e799b49/86581709461.pdfIn PDF document text
    • https://scalper.ir/data/files/file/tasiwuliwedinezixu.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xikomojovuwajuzigaj.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/26521473674.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210911055230.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zogerojosu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/93294215644.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/jonaribexozud.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/54775814275.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sonupisexanigo.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_off0000b874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 10296 bytes
SHA-256: 29986af17c1787814c3b4accf888baf04384a8ac5144847110ea50cf8155ab97
font_02_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 16224 bytes
SHA-256: d6c7dc3c082d0dda9046cee9d5459d3032b9a1a78147c752e354a750d7104c99