Malicious PDF — malware analysis report

Static analysis result for SHA-256 7388b09690e64ce7…

MALICIOUS

PDF

93.0 KB Created: 2021-06-13 08:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a22898a28d1a16a464e4adb006b83c9 SHA-1: 763772b75fc79b02c622f9f70abdcb0fd82fe0a1 SHA-256: 7388b09690e64ce772cf541e7c14eb6b2d8b4b688ad7cbc6c04e9486f9f8b750
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and uses a link farm strategy to obscure the ultimate destination. The document body, though heavily obfuscated, suggests a lure related to an 'installation guide', likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/123?utm_term=brocade+6510+installation+guide
    • https://tuzibexidove.weebly.com/uploads/1/3/4/8/134852131/e2cd130494cf4ff.pdf
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fc90fb491754.pdf
    • https://cdn-cms.f-static.net/uploads/4404285/normal_603e07c8ec856.pdf
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5fcf2eaea6b94.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60bb46ebb6857.pdf
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fcf0c6f6e7da.pdf
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/b0bdcf6aabb84.pdf
    • https://kivuvuvilex.weebly.com/uploads/1/3/2/7/132741385/kinozafemodejalakem.pdf
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600f95e4dfde7.pdf
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5ff9f85a9080d.pdf
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/nolosufunawebe.pdf
    • https://senesawepemij.weebly.com/uploads/1/3/7/5/137503152/zemuguwavab-zosufevefovotuw.pdf
    • https://static.s123-cdn-static-d.com/uploads/4411250/normal_60b130b681adc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sijomirurefi.pbworks.com/w/file/fetch/145187271/deretut.pdf
    • https://uploads.strikinglycdn.com/files/f61a05f8-2562-4204-9270-bd4248425f9e/whirlpool_model_wrf560seym05_ice_maker.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144423783/73908974131.pdf
    • http://keborekudud.pbworks.com/w/file/fetch/145168995/42240976816.pdf
    • http://tipewizu.pbworks.com/w/file/fetch/145233267/x_intercept_and_y_intercept_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/8b331d76-1337-4f1d-8153-cc651eb976fd/wunabizav.pdf
    • https://uploads.strikinglycdn.com/files/390a6f97-64e4-4e94-ad46-6e8a01d1528a/97828741434.pdf
    • https://uploads.strikinglycdn.com/files/b047ea01-2cb3-4233-ba9b-edbdb444eea3/kitchenaid_stand_mixer_replacement_parts_canada.pdf
    • https://uploads.strikinglycdn.com/files/81fed527-2a2c-4f7d-a249-a7cf486aa8ae/65588329605.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f952.bin
3f40340dabde4a027ffe7ce9686052e781cab0e3607f3c77f26084c0603adcb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 15172 bytes
font_01_sfnt_off00012abb.bin
33dfb79f1f2ab2b6bac591c9851e7edf86e007f6aeb969f7096563ce0bd32a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 5628 bytes
font_02_sfnt_off00013df0.bin
6be54a09e6dd4703db53a447781962d3148af65f431a56adabd8ddc03641b870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 12296 bytes

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