Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc76f016b8be6c5…

MALICIOUS

PDF

78.9 KB Created: 2021-03-13 23:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ff144b4657240a6d3712d3a48106e5 SHA-1: 2b67578cdcaefcf153665a5daad8210a6ab7f8ba SHA-256: 1fc76f016b8be6c5c65e8a9cafab1ef1d124bcce9afdbf68f3a80e17ea4ac683
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' designed to host a large number of external PDF files. One of the primary URLs, 'https://jumiwimov.ru/123?utm_term=logo+quiz+answers+level+158', suggests a lure related to 'Logo quiz answers'. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=logo+quiz+answers+level+158
    • http://koxivesuvif.mypressonline.com/46481747544.pdf
    • http://giwosoto.sportsontheweb.net/vavarimajurixisezikepep.pdf
    • http://zutatowatipo.mywebcommunity.org/mixabadazabunidomasisasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zegifuf.epizy.com/35459861308.pdf
    • https://uploads.strikinglycdn.com/files/1c3d050b-52c1-4b54-9d63-047ec384ff5e/gowadufogusajujimavexag.pdf
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_b631bffe3faf4acfb9e53ddc45c15c4e.pdf?index=true
    • http://velelakolifuvu.onlinewebshop.net/verbal_analogy_worksheets.pdf
    • http://lajovaputap.myartsonline.com/bodyboss_method_free.pdf
    • http://bememikat.onlinewebshop.net/in_his_book_civilization_and_its_discontents_freud_argued_that.pdf
    • https://uploads.strikinglycdn.com/files/ee210698-bb9e-44ce-a646-98dd4c225dae/neil_gaiman_norse_mythology_hardcover.pdf
    • https://uploads.strikinglycdn.com/files/dadcb1c2-f4a8-4ce8-9394-e5c7f572d87a/98048811897.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_388e4a2e170c4e558b7cb01d0545d790.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f6efe34-65fb-469a-ae3a-3849b02f527a/vatujuletijanax.pdf
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_bc8a366cf1b14365b5e5086334ce7a32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bce86a22-209a-4493-947b-d1951b62b8b2/state_employees_credit_union_north_carolina.pdf
    • http://sidepojedava.myartsonline.com/what_are_the_four_social_media_zones.pdf
    • https://uploads.strikinglycdn.com/files/0afce712-2ca8-484d-8894-97c03772247c/26872509814.pdf
    • https://uploads.strikinglycdn.com/files/f801f2ba-27c1-49f7-ab65-cdc660874c37/gomejipobijafoxozevovi.pdf
    • https://uploads.strikinglycdn.com/files/f85f82f3-9c66-42ee-9b80-8f613aac57f6/verifone_ruby_ci_manual.pdf
    • https://uploads.strikinglycdn.com/files/0e3d30c8-4c10-4a56-8224-5f0352dca8bd/38076134811.pdf
    • http://jifunujori.rf.gd/fomavatisosapo.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_5ba985686d9544e080af66f7f36116d3.pdf?index=true
    • http://losalevova.epizy.com/free_retail_inventory_excel_template.pdf
    • https://uploads.strikinglycdn.com/files/eaf32f32-61b9-4cfd-b758-ec6a86145701/99964021885.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e188.bin
b6659bde7a6f26ca8639873f4980cd67e7a4df68525dc7184b73614260529025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 5492 bytes
font_01_sfnt_off0000f471.bin
cc0883f58aafb202813ef738f5932361297e97e97b66447902e1c6d345c18cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10696 bytes
font_02_sfnt_off00011915.bin
3b1167557c0500c78008053c404847a906c4d495ef15adec583fc97e76626070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16068 bytes

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