Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b0e85b5a19f5b7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 22:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39eb41a9f8dfeb91135cb410333368ec SHA-1: b32deb680053c16ab64f65a0e4ba5c7f5d95bb3b SHA-256: 44b0e85b5a19f5b7ebe6c8e0e32e9eb214379703bcccd6095bbfc6a720a8d7b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is designed as a link farm, pointing to numerous external domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is intended to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/78535792245.pdf In PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/22607920089.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/26863768920.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/10677057055.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331c99878a3---78134663311.pdfIn PDF document text
    • http://goldmustang.ru/files/files/7478733750.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0c9b75ee---zuluwitof.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/78451532095.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/luzuvidod.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/97043485083.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210902_97A91D35A92AF0AB.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8350817726.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109010533274157.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/69776240618.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/sebasuzediluman.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/98930985524.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210903021902_nitw25.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/rewolugonuk.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rerilase.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/fotiraral.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/8613625156132a1860f6e6.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/puxegesu.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109051238187283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=uninstall+weather+app+androidPDF 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_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 10584 bytes
SHA-256: af64140d852e4f13c83d8e6e986651066cb07e38e6ab6168eb47d36bbb3d1096
font_01_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16556 bytes
SHA-256: e152a40bf74db4857fba2f7527605cae194b8f7c6a598422ecd3d935ce38f005

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