Malicious PDF — malware analysis report

Static analysis result for SHA-256 7068d255dd9bb452…

MALICIOUS

PDF

73.5 KB Created: 2021-03-20 20:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0753b25117b47f150478980d08ef9a19 SHA-1: 9d059d1f793d1e528d8df9d17dfd14fa6c6ebc19 SHA-256: 7068d255dd9bb45286f722fcffa9a7a1d644e1cb20914525d38d27657804a2e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for books. The primary URL, 'https://pelibifir.ru/award?keyword=andromaque+bibliolyc%25C3%25A9e+pdf', suggests a lure related to book searches. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

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://pelibifir.ru/award?keyword=andromaque+bibliolyc%25C3%25A9e+pdf
    • http://mareson.getenjoyment.net/the_art_of_loving_erich_fromm.pdf
    • http://raxejudesezix.scienceontheweb.net/womafutegufajozixegiduxox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_4c54a91767c142798c00f798fc3b356a.pdf?index=true
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_1601a3fa731649ab8c7cd92038bfca24.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_cba9a9fa4abd4348b917c2eee5197ab2.pdf?index=true
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_12539e6fb116416ebcb2c10a0be6d19e.pdf?index=true
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_12d34e72a0c745d383c63c35fdf4b3f6.pdf?index=true
    • http://lusovipipowa.epizy.com/xonidajoweranub.pdf
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_4f492ac60355493eae86cab323f25bbe.pdf?index=true
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_89a2d00a53454e0ea1b1e4740f14c9a2.pdf?index=true
    • http://vurosija.epizy.com/el_arte_de_no_amargarse_la_vida_de_rafael_santandreu_descargar_gratis.pdf
    • http://jakezijaredu.epizy.com/buckingham_pi_theorem_examples.pdf
    • http://kunipotow.epizy.com/carnegie_learning_integrated_math_2_answers.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_20bd57ef55c947b998ecd0458a63b0b5.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_0032c904f2e749079161b69cbca748d2.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_2fca00ea82fe449f9ddcdc19bf48511d.pdf?index=true
    • http://kuzemepusiloj.onlinewebshop.net/calculus_and_its_applications.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_85635b6ff5164c5d8a4b38131f2f8dcc.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_6ad673fafb734e8385e25d61a812c3de.pdf?index=true
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_b66557dc12d94d2e8a1f05f04ba0eea6.pdf?index=true
    • http://diwevobu.rf.gd/centrismo_in_italia.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_off0000de85.bin
80f1176889757b06366ec1ff9203cce7991dbe7117c94e88bd47885b5de25184		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 5624 bytes
font_01_sfnt_off0000f14d.bin
5523349dcce9ed03b9e8cee4332dbd0b7b053ecc8e017b8689d734700e4f5f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 11596 bytes

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