Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42236d0b0f7310…

MALICIOUS

PDF

92.0 KB Created: 2021-09-13 20:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9de0b7403b7daab8c75f789024c01f6 SHA-1: bfae71e2c9d73d487a21a90271e8db4a4edc2115 SHA-256: cd42236d0b0f73104c105e590e9a3695ed8b979d328ad23464363dff9642bf92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://china-guolin.com/filespath/files/20210912005709.pdf In PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/pizuwopowogiwusu.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nofoxomukakeguput.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/53110818362.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/40848980563.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/92028376033.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/33671915019.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/5713612512.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/gurawalifukelurowa.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/bopawararinegev.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/taveviriri.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109092001232805649ndwi5.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/zokawubigimek.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/71282650136.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/52346239330.pdfIn PDF document text
    • https://yodobashi-church.com/zaradazazisi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130585106d50---51797997597.pdfIn PDF document text
    • http://moneymaker-gold.de/files/56564510393.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2c6de9dfe5f967b8589bcea5d5b72e53/texowetewut.pdfIn PDF document text
    • http://carbonelite.ru/file/vajapipu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/82346017384.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/jebakogagololoxogafi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/vebawexukofijokupetefutu.pdfIn PDF document text
    • https://windscrm.net/files/file/zubejofisibix.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/65642375983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bring+it+in+it+to+win+it+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_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10532 bytes
SHA-256: aeb43c1b1bbd4122d7f34a346c835f0fae68ae3124eebc834203008c64ca8fe5
font_01_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 17228 bytes
SHA-256: 8c248801f5bb7ff4e217bc23c086c7a0f9fc9012a26ce407a93a1b70e1d0d154

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