Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36ca08f5887b17e…

MALICIOUS

PDF

107.6 KB Created: 2021-09-16 16:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ae7b366c4c302b32f15cd78490e75d1 SHA-1: dbb6ddba935004b4a8125235fa51423859259ce8 SHA-256: c36ca08f5887b17eeed7b0d292ff95916b202799bc7717a805895f4a4ccb9dd1
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 document body, though heavily obfuscated, contains references to 'mario kart nds rom download', suggesting a lure to a link farm. The presence of numerous embedded URLs, many pointing to disposable hosting, further supports the link farm attack pattern. No scripts were extracted, but the PDF structure itself is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://lemarko.com/userfiles/file/pagefexosidikeletofogi.pdf In PDF document text
    • http://archetipoingegneria.it/userfiles/files/49659745617.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/jugokapalepanozexin.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/pojazojafodegemujixobul.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/74279668122.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/72790747717.pdfIn PDF document text
    • http://chamdure.com/DATA/files/8226659208.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/18565221319.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/mejipik.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/pijexozekabedobaviji.pdfIn PDF document text
    • http://wenxuezj.com/images/File/79575224730.pdfIn PDF document text
    • http://halaljones.com/uploads/files/36363538693.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/muwobo.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/34076808058.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/vumokizuvakaripajazuma.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142969cbb6c7---lavubufidurelidumonik.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/sudogikinoliw.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/87320298026.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902184626_gnypdx.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/wajebuwavetalowagoge.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a603acfe---4065640958.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/45414959103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mario+kart+nds+rom+downloadPDF 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_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15852 10448 bytes
SHA-256: fea55f50999f8e7fe30e0a15ae1f58d3af6285f09a3f6ac6342a2b986c73a148
font_02_sfnt_off00017009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17009 18624 bytes
SHA-256: 7d3289790681cb8f6f26af486e1a0ecf25f663364fc421b7917810f6943937de

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