Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc831f7affe2bcf1…

MALICIOUS

PDF

99.8 KB Created: 2021-09-13 00:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ca7cb469a615e84aea6b6179c17f46f SHA-1: 85010d16a52211ca9f7f539073d8e401c2d33f08 SHA-256: bc831f7affe2bcf1cf74736b668126bee1b0d6f99a45f2eb894907fb834aab30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure malicious destinations. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://watdoenwevandaag.nl/upload/wuvevanusoxarezazinigijo.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b43e279---bumikupurexumojuxim.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/73369825859.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lawoxuxi.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wuxajesotujejenomonod.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/79267573752.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/80044554024.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/4048457548.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f1fb3fe8---74122554129.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/40286630665.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/tosukux.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/15836785023.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vefiwomabiwuvidakasek.pdfIn PDF document text
    • https://506hlapeta.com/files/file/20387591191.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/7186590048.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xamomekekokaluganexozila.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/vasekebodiwaluzusokegi.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tudop.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/kavar.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210912_172234.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109111807255890.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/26443576966.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/tubutodupubajofodapukol.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/51293250930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+snorlax+weightPDF 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_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 21976 bytes
SHA-256: 8407032d662824fab53c96ba525d4b48300dc56e446c3cb3373f504b5194867b
font_01_sfnt_off00015086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001689d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689D 10836 bytes
SHA-256: 9bb34f54a69bbb8deecf06774b1729a445ef6f50a1155a58db73f32f56662fb1

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