Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c849a87379f9b1d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 12:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cab00e88ac311f37e325c9aae3974938 SHA-1: 7604da93d2769031bea4f0700315291305593e7a SHA-256: 1c849a87379f9b1dc4bb7572657ae4e5a3319d99fc95f76230a40e85e31f9970
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, while many are marked as unknown, reinforce this pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://massageindex.nl/images/uploads/jonuneseneworusava.pdf In PDF document text
    • http://golfvillageonline.com/userfiles/file/71025245245.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/67105155963.pdfIn PDF document text
    • https://10fci.org/userfiles/file/vibaxaniwid.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wazimu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f7vlgkh63jr8i7at5t1ifj44j1/19511417105.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/13010620565.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/24377676094.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/24756780498.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/ketesitupuga.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/23528330828.pdfIn PDF document text
    • http://elsped.hu/files/file/63956500777.pdfIn PDF document text
    • http://kftchem.com/upload/files/59676464182.pdfIn PDF document text
    • http://eva.am/files/05f074f842b7e201.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/19182170781.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/xadusovogivujurodebipin.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/tijubuzimimalubozub.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/bilopipiju.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/35305920014.pdfIn PDF document text
    • http://ducnhua.com/upload/files/44332875163.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/50280678654.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/sovanujovareputobufenet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=video+maker+video+editor+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_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 18148 bytes
SHA-256: 0e745b4ca710ab418fa765b866cad87df9c0e02339b71753b6b782a4b5bc91ce
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 10364 bytes
SHA-256: 1cd9d992ca9971f2dc03cdba296b2a261ea57e19f02fa99823176439694bbfc7

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