Malicious PDF — malware analysis report

Static analysis result for SHA-256 884c4bda3880f4ad…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 00:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c831126cc15b22e8b2ee30ee20aba250 SHA-1: 4b6d2db97a6e60e2e82b1bc33523aae6a4a30f1b SHA-256: 884c4bda3880f4ad1c0a889cd3eaa0f5b9edb7a08a6c9b505763e4229e97cd11
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, including one pointing to an IP address, and is flagged as a link farm on disposable hosting. ML and ClamAV classifiers strongly indicate maliciousness, specifically a phishing or trojan threat. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://smidgel.ru/uplcv?utm_term=god+of+war+4+ppsspp+game+download PDF link annotation
    • http://gsmontaggi.it/userfiles/files/56113687172.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/48jtmlaaeg20ii0ff5v748s433/pojawo.pdfIn PDF document text
    • http://christopherdallo.com/file/pimunad.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/66788120608.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c922c0183---88294396195.pdfIn PDF document text
    • http://agilesolutions.in/uploads/sobafexekutukomate.pdfIn PDF document text
    • https://ibextrail.com/editor-images/makewebasaduzoxelinemu.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/giwafesix.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/sijel.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kikax.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gidavemoginumokimafidas.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/4106293219.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/32579932752.pdfIn PDF document text
    • http://maihome.hu/admin1/file/kobenijirukuze.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_070716.pdfPDF link annotation
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/54057943663.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/38906641127.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/getovejaseg.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/dowozozarebixixorokalub.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/88980506058.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/23748321386.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/zaruvazem.pdfIn PDF document text
    • http://sin-hua.org/userfiles/68219714574.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/51729442690.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_off0000babe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 17016 bytes
SHA-256: 0d8429281bf34eb2234189e438d0e0be0bc6f0a59244f33c59cf537dce0585f3
font_02_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10852 bytes
SHA-256: 074aae458abffbb5b6ce2509885a41192d0ad73aeebc425a7435dce550edf986