Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9abb40efb84e8fd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 10:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b1d36d1123fe69eec65ac9af28cfce8 SHA-1: 6019f35543009c9516c8ffd4d3b56db4044deb33 SHA-256: a9abb40efb84e8fd0d7df9abfc9b87bf9c9f08d0bfd106fabfbd431ad4c72727
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick users into calling a number in a context of billing or security issues, further supporting a phishing or scam attempt. The presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=volume+notification+apk PDF link annotation
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zatowigabetovefipudowuvil.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/75232966394.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/84538481900.pdfIn PDF document text
    • https://reha.bg/content/upload/file/13820789170.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wuzatoluxunetuzeb.pdfIn PDF document text
    • http://wawa757.com/uploads/files/moradunogipuxevuv.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109062050539350.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/55643226193.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/99757048069.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/dawogariniwir.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pitepaka.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/26463686029.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99792638787.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/30491191176.pdfIn PDF document text
    • http://balalajka.nu/media/78957250015.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/44103920741.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/30556995415.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kumurewokilajabekofib.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xuvidigi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/mewexi.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/wugipifik.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d2a200b41d260940d94f9c3ac1bfd457/suliwipurafegezor.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/wemaderudegaf.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gubamojidewovedikuxiwujol.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/8996898962.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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 10536 bytes
SHA-256: faa52d9378ee1de55c255eb11875e41d0fb525bca9f753d130aa130bc0a1a295
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 17712 bytes
SHA-256: 39f42012a818ed0b8b534b6edbf4cee02c574cae907c92a1fa581f83506d4df9
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1