Malicious PDF — malware analysis report

Static analysis result for SHA-256 3088d270a74b46bd…

MALICIOUS

PDF

78.0 KB Created: 2021-03-31 01:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ccc2a1fb13be9b29164a5ec5fab2e32c SHA-1: c111297dbb3b3c5da23a29b006f149682cf79456 SHA-256: 3088d270a74b46bddab7e6e4e859c04aeb06ff166e0c7ffe23acb572a1559d5d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to water heaters, directing users to a suspicious URL. The presence of multiple external URIs and link farm characteristics further indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+to+wire+rheem+electric+tankless+water+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490724/normal_602e701e45634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_600c60180ee32.pdfIn PDF document text
    • http://it50off.pro/828187566796vgsq.pdfIn PDF document text
    • http://hamsterbig.com/stihl_weed_wackers_for_sale9l9cb.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/29288282487.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/vejowalezarosinekuzisenofhpjc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6002d1a940069.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/sandeep_garg_accountancy_class_11_solutions.pdfIn PDF document text
    • http://sellamorem.com/53935686476qbkkh.pdfIn PDF document text
    • http://dragonflysagewellness.com/chess_game_free_download_for_windows_10_filehippo3j6a0.pdfIn PDF document text
    • http://xewodatesuporob.mypressonline.com/71698448926.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/wezedegokuwefox.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/patofisiologi_pneumonia_pada_anak.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_to_use_casio_alarm_chrono_watch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_0c63b7bb0bd5452c9f55b0fe6098fea8.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_9bc50dc2070b4a6f843575e5936c68a1.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/24093132803.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_9a47a3416a124b01ba507b0f6e4102db.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4bab66e5f92244edbf1d5d26383e8752.pdf?index=trueIn PDF document text
    • http://panexorumilogim.myartsonline.com/sound_engineering_syllabus.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/kagoxun.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_3f80406ee4a841039d30f8697cdb036f.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5156 bytes
SHA-256: d33bc47cdca48b5622bd105cc325116ff5a038ebc9c54dba144f1aa36df17d36
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10848 bytes
SHA-256: 6d4fafb4fb9bd72cc19a9b98a7f0e85966de4937952f3e6c294f57177ee86feb

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