Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad3e40d3e87bfc4…

MALICIOUS

PDF

77.0 KB Created: 2021-04-07 18:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5143479bbc33ba52ee70e43c2ce7eb1a SHA-1: 232e56b7defedc6c7737bbea22b0d61421419f3c SHA-256: 6ad3e40d3e87bfc44208e21f096db0700e249a0cbac6dd77480b4a636c96cfb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest the document is designed to redirect users to potentially malicious sites for further exploitation.

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://dafemum.ru/strik?utm_term=master+forge+grill+model+sh3118b
    • http://matemepujibad.scienceontheweb.net/vozisanaledujebezab.pdf
    • http://marifivelaj.mygamesonline.org/49600014143.pdf
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/tujetiluko-mogor-mazipi.pdf
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/e5eec1.pdf
    • https://nepibosumu.weebly.com/uploads/1/3/4/3/134363752/ronoparuwimogozuguto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_18a34518d9114a978d49897f64222ebf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8efbba3-a4ef-45ff-9059-0a56e4be6ae5/best_free_audio_mixer_software.pdf
    • https://s3.amazonaws.com/marimejerebo/tisivifileke.pdf
    • https://s3.amazonaws.com/najipavez/43831269649.pdf
    • https://uploads.strikinglycdn.com/files/231c197b-4d3c-454d-be21-a082cfa51da7/does_family_dollar_sell_pet_supplies.pdf
    • http://koriwironawuva.myartsonline.com/selalalukezepafewadag.pdf
    • http://nedizilunok.myartsonline.com/89903197121.pdf
    • https://s3.amazonaws.com/befafuni/bissell_proheat_advanced_brush_not_spinning.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_239e30de52da4e538a4233ca4308564e.pdf?index=true
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_c13bae97728c46a7aa2890524a70e783.pdf?index=true
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_95cabe47540d473e9481d742f0f34838.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5056d34d-08a7-4c14-9e51-5daf025c3daf/why_did_my_foodsaver_stopped_working.pdf
    • https://uploads.strikinglycdn.com/files/3c0765b1-c247-4b85-a22e-45dd26ca4801/daganorixiwal.pdf
    • https://uploads.strikinglycdn.com/files/4e9a03f4-94ad-4281-b2c4-57bc5307019d/definicion_primeros_auxilios_oms.pdf
    • https://s3.amazonaws.com/libosokune/fivutasixunakenafiporobu.pdf
    • https://s3.amazonaws.com/kufazete/rudedekarozinumugeg.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_off0000ebf7.bin
83a06a99497258e3792f884f8c85b9c3b4b50d534192d183ea160bdc13e67b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 5876 bytes
font_01_sfnt_off0000ffd5.bin
c37a071f5d9193fcb9c364035fb443d892c038868ecb7e1e26fcb6db377fcaea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 11360 bytes

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