Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a7fb12f9c610a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 07:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c03078abc66528f4fefa0d80ab058222 SHA-1: d7be647140d29e097e4aa17394f19d9750cbd3e9 SHA-256: a90a7fb12f9c610a27a4021889c0a071af1b124c49fd78a63728ca1d051db493
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLICKFIX' heuristic specifically points to a social engineering attack where the document instructs the user to execute a command, likely to bypass security measures and download a secondary payload. The presence of numerous external URLs, including one pointing to a raw IP address, suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=ssh+terminal+for+android PDF link annotation
    • http://fantasymusic.it/userfiles/files/7165152737.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/genuletebe.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c995740eaa9994beb2480f23a57bcef8/88065584605.pdfIn PDF document text
    • https://forumsevens.com/images/file/dezojenudowulonupik.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/82382851497.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f69777cc2---7764398512.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77168658777.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/a37df5cceae1c31574a48692017ca7ad.pdfIn PDF document text
    • http://chinalabware.es/d/files/xuwurava.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/99002807899.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/94615508083.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/61390086843.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/71394647006.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/vitirul.pdfIn PDF document text
    • http://ccadl.com/files/20210913234348.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/44554789125.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/gefikegazapozobip.pdfPDF link annotation
    • http://saringkarnwood.com/UserFiles/file/88301423414.pdfIn PDF document text
    • http://atya.eu/files/file/fizutibizala.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/77488419866.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/wexomokajiwameput.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/79803029981.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/luninememino.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/xotiredadigepizowewila.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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 10696 bytes
SHA-256: f1b277244bad7e8be16fa8768ab98525cff79181f57a38160e2360b2cd22637f
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 18068 bytes
SHA-256: 02a6c9783cb106bc1719c49dbfd5d10aeac6aaee73b2a224e265861a57eac4ff