Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c093761e5a7aaa…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 05:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d02633d0cec9fa5b2f5a1eece3ab561 SHA-1: ca99c19c0f87d5473ac8d528ef1b11a24aa184f9 SHA-256: 87c093761e5a7aaa75a99b0cc750349f9454d3d242839141e7f1764ccafada7f
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were directly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.tamtrebinhminh.com/public/files/27340668950.pdf In PDF document text
    • http://ohmamakitchen.com/uploads/files/67330245550.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/89509341749.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/11468288271.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/detitupatarolipe.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lumigomarogumu.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/62424461024.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/ketewojurumokutepakixu.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/watidulisaserar.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/zidefutizote.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/12745346868.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/22054394120.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/mofapivosirariwe.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/10397247202.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/26354644834.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631579728.pdfIn PDF document text
    • http://halanmilk.com/upload/files/17487706804.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614905fdef98a---56626326607.pdfIn PDF document text
    • http://awards.nl/img/cms/file/46151961802.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vuguxiluwejurisapidizevug.pdfIn PDF document text
    • http://finchamauto.com/pics/49604731374.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/30456832973.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/19190132473.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/97807477218.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/zelidinavibatawuketup.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/tobuxizoboxufupikej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+you+switch+sim+card+from+android+to+iphonePDF 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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 17632 bytes
SHA-256: 8043fc98bc1d3894e054d28bf57b91bad1534f6f3e35b9b56d6f497bc9dbd2a3
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 11172 bytes
SHA-256: 0ad068e396ad8bf0f958ea98252f6d61dfe719e9a06f4ed75fe4db4901a62fa1
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1