Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad73bacfa25c9349…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 11:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aaeb4c0a4b655bb950067be05ff2ac65 SHA-1: 19ad362fc9889267db02cfbcde372f2a8f749fa0 SHA-256: ad73bacfa25c93492cba5f1aca79c69ed067a3328608e4da3c39516a6d72ae41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=how+to+get+my+apps+back+after+restore+android PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/541d098c1f9168d3638a5d7647b41a74/76189399790.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/lowuzurul.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/78953024304.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/4875311713.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/81550952084.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zosuvumi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090917535185.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/31985193240.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/92294455149.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/34526607823.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/78825528061.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/dufiboxejekepep.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109101955051558.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/11317792494.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zipufewukisabip.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/26760585688.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210905005336.pdfIn PDF document text
    • https://mfdesign.hu/files/file/16189023411.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/dipubetaged.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090204011380554.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/sodotidiweva.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/31961920436.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 17084 bytes
SHA-256: d62ee807bcc3c8d86f579b0db1d27ad21ea19819d42a54c9033d87c80a3c58d5
font_02_sfnt_off0001220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220B 11340 bytes
SHA-256: a05c278ae0c75992f8d4c74c9296c9bbfc2bd4bd773774c16230fc7b7a2a33ab

Open this report in the interactive analyzer, or submit your own file for analysis.