Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13e4a98f2101f83…

MALICIOUS

PDF

95.1 KB Created: 2021-09-19 00:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 692e6b881cec2be1084e1007ed637650 SHA-1: 15cf6eb30a5b876c5d27fba716a51e7f035700af SHA-256: b13e4a98f2101f834687d15b15c93a3c573202c068b84c1e0b45da97d306cb7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://autosoftware.company/autoresponders_images/files/8623060536.pdf In PDF document text
    • https://coebmsf.com/userfiles/file/30894062714.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rowawosupesi.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_A461A19351A0C47D.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jogoberelemaki.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/61947540936.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/94923755409.pdfIn PDF document text
    • https://egca.fr/userfiles/file/sanogisaxomowurowomamugom.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/ziloponelofulir.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/27632109779.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86106427034.pdfIn PDF document text
    • http://precisao.org/files/files/60231880344.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sofodeduxojawagej.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/popuweli.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/58835987075.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/rawavekekovumis.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gomowelekenemirewazobeka.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/nivewapapedaliwozubarowa.pdfIn PDF document text
    • http://www.og2c.com/images/file/tawozisopizilenigodev.pdfIn PDF document text
    • http://skupka54.ru/upload/m/wilovo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/judatibobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=virtual+backup+apkPDF 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_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10144 bytes
SHA-256: 0064fb29583792bb4d768280b68932efdb967e5b412d338e3264f5e289157ad6
font_01_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 20656 bytes
SHA-256: a5ad57424afd7c81c97fe35207fe1b8cc8aa6fadd4c498604b00e9297caa1a79

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