Malicious PDF — malware analysis report

Static analysis result for SHA-256 51484986028fa85d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-08 21:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a7e1285fbce210abeb0008e2e0d7d74 SHA-1: 1cb9aae81e044e668cf7b73e6d3f148dceb1183c SHA-256: 51484986028fa85d03788ee4bfe9bdba9b4b7a312230dfa95ba137a106da0fd3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The primary suspicious URL identified is 'https://resalured.ru/award?keyword=business+management+skills+notes+pdf', which is likely used for phishing or to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=business+management+skills+notes+pdf PDF link annotation
    • https://dasaxurakusep.weebly.com/uploads/1/3/4/0/134017902/8c18b532.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/labixufiguguwurefi.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/74335371712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_b70de08bb4b8492493042fd704e86775.pdf?index=trueIn PDF document text
    • http://supajiwa.myartsonline.com/merriam_webster_dictionary_free.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_4e40bbfb44aa47c7b683b33810fe7233.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_a3abaac0eec04494805f5407c4307d08.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_646371f4d96f4279bdca5dac7497ed85.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_e6ca8ea873e24ecdaf3c0724510dbf71.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_ebb79e41a8b840dfbcf42fda9b0cad93.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_12ef4b57ceb54470ad7ab4e3fa4dd4c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d162405-4467-4fdc-995d-89a0a0e3832d/81841272729.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_49755a3147824172b6bd04f1b71260ad.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_f53490b7cc6943c99709e2448dd71942.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/bibezitamafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c812c2e-6162-4e6f-a7fa-c929c04bc745/streaming_nancy_drew_and_the_hidden_staircase.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_02152bfd5d604c93be39d7a3b57d433f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe973d8-c5a3-4c22-bb29-0ded1e96f336/fikelevirisogam.pdfIn PDF document text
    • http://baxewape.myartsonline.com/20167212880.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f84ebc8c14ee45f893c60ee4aa036e71.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 5376 bytes
SHA-256: e12384933d44d1587942e5c9a60b55538c7a109a740e636f1bcf392efb830eec
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10404 bytes
SHA-256: 115bd70737d923a86226209851f4de01ded6c81dd81eff8bcf384eab4a5ee65d