Malicious PDF — malware analysis report

Static analysis result for SHA-256 da78b538d13af8d5…

MALICIOUS

PDF

95.8 KB Created: 2021-09-20 20:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17a007dc31ca1769c5ad236fcd002dc7 SHA-1: bc32feed9ef0d41724a5df3dc9e036da6a14f187 SHA-256: da78b538d13af8d516f2754cb1569df1e55ed523e067d35c10ffc4375569ec61
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URIs pointing to various domains, many of which are likely disposable, indicating a link farm designed to obscure the ultimate destination. The presence of a raw IP address in one of the URIs further suggests malicious intent. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://altelaw.com/uploads/image/file/18580226747.pdf In PDF document text
    • http://rambud.pl/uploaded/file/wakepopimifudofuruse.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/260744274.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/83654078018.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/lemalujupebiniteriwujokow.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/bigajofutibakexaz.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/42299949684.pdfIn PDF document text
    • http://artdental.hu/editor_up/sanuvigokula.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jojanupojalepap.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/33240489932.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0590e802d---wajodivepuguzi.pdfIn PDF document text
    • http://metzlerranch.com/userimages/xubovagogumagujewov.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/96287292236.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/42587725054.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/gemomeduxo.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/22176042431.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rfhlfesdpkkc2tqd14m7v9cqv7/21371618826.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/mataw.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/tavukodipejujuziv.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/mevodudofibigisa.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/jutaw.pdfPDF link annotation
    • http://wjvanderheidedienstverlening.nl/uploads/file/xutipoz.pdfIn PDF document text
    • http://katela.net/userData/board/file/16512280367.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_3BD31B600A576C17.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adaline+full+moviePDF link annotation
    • 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_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 10296 bytes
SHA-256: 382d9d8ed8848f43a82d18a6db23e473c8c9658ab2429430e83d42213bc3b712
font_01_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 17680 bytes
SHA-256: b82278259b0114e103e9b8d0c3c8d823c34f37d67b5941221d3dac32c9b849e3
font_02_sfnt_off000159ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1