Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b499b50e44c0d0c…

MALICIOUS

PDF

85.5 KB Created: 2021-03-19 14:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a49643ba515dccad67e33ad65709c514 SHA-1: 23a527f6b555a784a243b9249c6e52f7a26bb0ca SHA-256: 4b499b50e44c0d0ccce4a42a052645db6340659cbf414c63716878fd8ce62b80
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://mezovuduw.ru/wix?keyword=honors+algebra+2+semester+1+final+exam+review, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/wix?keyword=honors+algebra+2+semester+1+final+exam+review PDF link annotation
    • http://vonexalux.sportsontheweb.net/eragon_book_5_release_date.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/bergeys_manual_of_determinative_bacteriology_9th_edition_free.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/47800735769.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/astm_a36_chemical_composition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_6de50f4a757c448189bd3ed76502f6a1.pdf?index=trueIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/how_to_install_janome_free_motion_quilting_foot.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_63652f7e618e43ab90c6eddf395ad9bd.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_bcd2926d96ee405fbd6da5a7585a207d.pdf?index=trueIn PDF document text
    • http://pitigapevede.onlinewebshop.net/cuanto_m2_tiene_un_metro_cuadrado.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_80aa5dd5081d49b3ada2a1e2837e29c4.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_302fe6555d4a4d5082fcd3b5763b3a12.pdf?index=trueIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_7687e719eee84015aabd37460d0ae0d6.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3cb9428a5eb84c6285a27106f995df19.pdf?index=trueIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/caballo_de_troya_4.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_0ed4caa7e6fa4f54aab262d0d2b52a9a.pdf?index=trueIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_1c190a8ddc9f46b685bc628bca738b9e.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_b95cb3476f04486e9099a813ec15e9c5.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_3f1b1b3b66574c7f952b6d9f24bcc3aa.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_be0d85c9ab954fcb9dfe0a93867a3373.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_2bf0d5bc3837409480567d82dc67160b.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 6588 bytes
SHA-256: 806e90c89f3333eb373fb5aa71c150e0fd6e6afa42647a67bbb093520452bef0
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5592 bytes
SHA-256: 683d75a3654c11b04bfb31b9d7e82e723a8145e757dc9b641f76bf270ee3ae65
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 12168 bytes
SHA-256: 9d5a096c3d101cf72dde8114c742b75d37725e8ad7b3a4335d4cbe2ac20a7418
font_03_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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