Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f40c2e0776712e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 04:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0285e1f02300b1ad9fa2abb06fb8ba2 SHA-1: 5a5d3eeb9f015a944248e2b8bb5dcb775a86165c SHA-256: 86f40c2e0776712e6547d18cf93bbd6b5ed64e9aa31f4cbb86549a5fc23b18a8
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, with a high-confidence heuristic flagging it as a link farm on disposable hosting. One of the extracted URLs, http://goldendoodlesofthesierranevadas.com/userfiles/file/73030503208.pdf, is specifically identified as a potential malicious link. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pcccmiennam.com/media/ftp/file/nezuzegabopus.pdf In PDF document text
    • https://shellserva.nl/docs/Image/file/wabogevupasobutosebuku.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/budego.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/gifawunopalakimanomoziv.pdfIn PDF document text
    • https://coil.hk/upload/files/zosizijewofalazobivafido.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/48442434092.pdfIn PDF document text
    • http://195exim.com/datas/files/zikigufotiwulon.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/budidugunidilokil.pdfIn PDF document text
    • http://ihdbd.org/upload/files/58556415069.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/73030503208.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/lelekesazopi.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/13051367169.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/91606896204.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090419202985.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/51044915968.pdfIn PDF document text
    • http://topflexsports.com/uploads/tedesovosugijun.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fanilapoxuwufejigibagit.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/wawetaxeru.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/naxajikelukoxine.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/muxulasinebiwutatufuner.pdfIn PDF document text
    • http://stl-hk.net/userfiles/renese.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/86644781822.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/fovuzisugevug.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/27063806473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=using+stylus+on+androidPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/dixifakejudosofub.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_off0000ba67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA67 10512 bytes
SHA-256: 9539764594752f7c1b01771e7549e92535048726bd941b53414f02cbd54cd2d0
font_01_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 18768 bytes
SHA-256: c22504d357b0e4a1274a01d17a00edca5f3af8000849d0cfba4654d42566ccd3
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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