Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd675d7416732d19…

MALICIOUS

PDF

73.1 KB Created: 2021-03-31 18:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fecccfce497402b7d84c6f1cd83651a SHA-1: d382fca488fe7a0c8d52ec89b8be5ce0a1b139f4 SHA-256: fd675d7416732d19ba0c665b72ebd4a2e6159ff6829374d1be926e7ebbf773b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm attacks to manipulate search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=case+study+examples+for+school+students+pdf
    • https://cdn.sqhk.co/zururodi/ifghgdG/fupekerefegefafuli.pdf
    • http://nesobaka9.xyz/371734346544ks2.pdf
    • http://brumbum3.xyz/emotional_guidance_scale_esther_hickslo8c9.pdf
    • http://zvezdasevera.online/lubimaborixuxunazxowf.pdf
    • http://ryukzak.digital/vuwezomuxoxezorukotemavv5fro.pdf
    • http://zatoboyvibor.fun/another_word_for_visualkr0uu.pdf
    • https://cdn.sqhk.co/xuxozowaki/epf4iji/ambareesha_kannada_hd_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_8b7b6aa23b86406fb3722a94e4d4ff5e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed9435b4-4ccd-4fb9-bdd0-10b750357723/weedeater_featherlite_sst25ce_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/2c2d99d7-4e1b-41b8-b1d3-a94c37b3791b/old_honeywell_8000_manual.pdf
    • https://uploads.strikinglycdn.com/files/b9193d6f-e8ad-407e-86f7-4ad975cc7d58/who_first_discovered_the_relationship_between_electricity_and_magnetism.pdf
    • https://uploads.strikinglycdn.com/files/4c00f507-f50d-4715-bbba-32c458d1064c/26006301601.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_56629ae046644d8192da0c038e6fac5e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c83a1d95-2462-4b9a-b396-cd5e5a8e18a6/90245686359.pdf
    • https://uploads.strikinglycdn.com/files/5dd27ac2-5a18-475d-8f88-6c1e9569e292/how_much_does_it_cost_to_replace_a_rooftop_unit.pdf
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3490a4f528aa4f68a7e072f262f8a659.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a308d9f-f6b4-483b-b646-9ddf5d6116b4/fogaxutukakoniwonexa.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_f235052de0614878ba554bd4c382fc36.pdf?index=true
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_2c570026b1b5445bbf9209fc940dd246.pdf?index=true
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_3d1860073c044057b85238abd7adf256.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_ac6a27d6fc304b90b128e11f27361fc7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2126f4e1-f8f7-488e-bd03-0858d5fa7ed4/76278699181.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02c.bin
a94deeaaf221c9aad28f99859507dfc4148120b4e8d4b70836b060a4d4b8520b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 5468 bytes
font_01_sfnt_off0000f2a9.bin
0f3bc7964b8160f8e4227419bf648602ecdf2ecb1b674ddd6352e0b231aa38a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 10820 bytes

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