Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4bffb7e546598a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 16:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8c299215a06a119a03bfbbeb2af4cae SHA-1: 6a25982d1e8f5137043b17458ba3d0a6a001e2b6 SHA-256: 4d4bffb7e546598a5fc5850287487d86ad5a43cf0d3b84c172de8278117f3d40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests an attempt to direct users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.primariasantana.ro/uploads/file/ladiw.pdf In PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/51890388970.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/53199079495.pdfIn PDF document text
    • https://aneri12.eu/res/file/92404620179.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/783c5c5a76d0cc4fa36e3172971cfcd5/99843713321.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/pimidekapemukizidu.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/18884820679.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f969255769---1153855461.pdfIn PDF document text
    • http://poliinc.com/upload/files/wedowexifebaku.pdfIn PDF document text
    • http://mobilenmr.com/files/files/zabegenarijiru.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/kukonusuwikoj.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/10983730489.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/43254507232.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/74089452592.pdfIn PDF document text
    • http://bresky.cz/res/file/pivufud.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/sototuvodemanimisenoza.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/xuxasuxosu.pdfIn PDF document text
    • https://aokman-drive.com/d/files/gizutifuxefifasotuta.pdfIn PDF document text
    • http://alvitraders.com/files/rawut.pdfIn PDF document text
    • https://tigapilar.com/upload/files/pofibuwirisorevelekosisop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+linex+icon+pack+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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10420 bytes
SHA-256: 71edf2c06ff49197973b3e253b99bbf4d8acef10b0397051a6c7e7e0ba57e419
font_02_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 19080 bytes
SHA-256: 3001b33531ef928d2bacc0c418fa2056f8539d7bcfbd9052481f3173460c4ab0

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