Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7616b4df2369878…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 11:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc4f4ba6f7a6014cfbf48c8f3ac932d8 SHA-1: 4f056bef004ef3c21ed4fd75127ad80437039b72 SHA-256: e7616b4df236987864e9c21f9f8ed57e3321fde5bb0c1d08c94892ce836140ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially malicious websites. The presence of multiple PDF-related heuristics further supports its classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=remove+clothes+app+download+for+android PDF link annotation
    • http://marcus-1.com/FileData/ckfinder/files/20210903_F6A8CC8808BF06F2.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/92959987326.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcca75c29c---47875703645.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e793d145e---xofitelaruvepere.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/8879909395.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwokipuganenaruv.pdfIn PDF document text
    • http://travellerisland.com/files/95666085468.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/78096234745.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/mezutabe.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/fugit.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/56889635173.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/talalipojagob.pdfIn PDF document text
    • http://stefani.cz/fck/file/94777278268.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/57340047080.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/92390915547.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/62256546371.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/59226093729.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/43873828107.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/78481002855.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/88005430323.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091301262573499.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/21510716461.pdfIn PDF document text
    • 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 11084 bytes
SHA-256: 78a87bf24e19339fad9e5ed05bba3c344db36520c30e75c8fae2d981bc3ca365
font_01_sfnt_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 17560 bytes
SHA-256: c7b07718519f4042fbc5fe23d78363bce34d884c07912c4339c38174ba62dddf

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