Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e02ab2c0388e59…

MALICIOUS

PDF

86.7 KB Created: 2021-03-20 01:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c2e1d64d42913490f77da489c3eb5a6c SHA-1: 6261755f48c5df3c1fd277e71e752118dbad0000 SHA-256: 36e02ab2c0388e595bf846dfe928451bfdd629c2f9fd67767a4ccddad8a17deb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting an attempt to redirect users to malicious content. The document body, though partially corrupted, indicates a lure related to 'worksheet answers', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=more+vertex+form+worksheet+answers PDF link annotation
    • https://nosugorowemuz.weebly.com/uploads/1/3/5/3/135327492/1167952.pdfIn PDF document text
    • http://lnstagram-office.com/xamalez44u4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_5fe9003b24dd9.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/tojubufopufioxr46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_601392e48c778.pdfIn PDF document text
    • http://abistrans.ru/from_the_depths_console_commandsibvqw.pdfIn PDF document text
    • http://casser.xyz/47549454050lf00a.pdfIn PDF document text
    • http://radanews.site/beauty_salon_special_services_2016_subtitle_indonesianols6.pdfIn PDF document text
    • http://ses-paypal.com/85925387790s5oje.pdfIn PDF document text
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/028500.pdfIn PDF document text
    • http://reduslim-official.website/isometric_drawing_autocadlle6j.pdfIn PDF document text
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/guvef-fowududufolu-zegelurajusu.pdfIn PDF document text
    • https://bosuditibopo.weebly.com/uploads/1/3/2/7/132740628/rejexupogagugub_vigixusawobanad_kupama_jafufedasasunet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/99814eb9-fb5c-41cf-81dc-5f51d3c838d7/jawititeworisoxozawizixe.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_b6a2a9a3f77f42c2b5bb146e0125ee24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcb5e6b-d7d2-4d39-8b8f-2df33ff02bd5/toro_snowblower_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850b9557-b6aa-4f2c-b4f2-49d029a57845/plane_shift_kaladesh_cleric_domains.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_6629aaac53764900b8a602617c7bdd4e.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_e8e05d1f8e1641489c3c466d264b32e5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 5004 bytes
SHA-256: dbcbafec71b52e039def84012dfdf5e6d376fa8520260ba88194f39386848254
font_01_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 11724 bytes
SHA-256: 8d683d9e6a6e3085960234def3762336453664f94deb074af2b20255250baa5b
font_02_sfnt_off00013f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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