Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba4e42f320f44e9…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 23:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccd38977eb197f036447e9a47d48a94 SHA-1: 5735d847fe6c9923fe741aa0a1e844609a03246d SHA-256: cba4e42f320f44e9702336f126e69ed1beaee6f266385ec33f51c7fe4984ccff
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, with 'https://resalured.ru/award?keyword=cateterismo+vesical+en+neonatos+pdf' and 'http://jelusuvobirolen.mywebcommunity.org/bojik.pdf' being prominent examples. The ML classifier strongly flags this PDF as malicious, suggesting it's designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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=cateterismo+vesical+en+neonatos+pdf
    • http://jelusuvobirolen.mywebcommunity.org/bojik.pdf
    • http://fekowepiz.mywebcommunity.org/binary_logistic_regression_spss.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sipanokule.onlinewebshop.net/migusadatekob.pdf
    • http://wutesejib.onlinewebshop.net/15351785034.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_347aeb737a75411bbfc5eb2119ad4597.pdf?index=true
    • https://uploads.strikinglycdn.com/files/258aa163-7bc8-4546-beb3-4f47963f4fc2/mutants_and_masterminds_2e_to_3e_conversion.pdf
    • http://lolunoxij.myartsonline.com/autocad_civil_3d_2020_tutorial_free_download.pdf
    • https://uploads.strikinglycdn.com/files/865a1f4c-f52c-477e-917e-1c9a14f08c3d/chevy_p30_step_van_specs.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_a69a048c93bf43eebc1e0f8f3525aabe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c49b399-dc16-4174-befb-63d3c5f616f6/48204404349.pdf
    • https://uploads.strikinglycdn.com/files/d5894c85-ca6d-4339-b887-ab7a12e259d0/25310424178.pdf
    • http://rimalapotozuf.epizy.com/25276748618.pdf
    • https://uploads.strikinglycdn.com/files/895131fd-5aaa-4df8-b79f-3dbf79c35951/vajafikubovogufefover.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_708e1858e0084111aff58554737f2a17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c50c9334-cb1a-457c-a813-a98d1be16806/migadodagefubakefovebi.pdf
    • https://uploads.strikinglycdn.com/files/7698b0c8-7d4b-4a7a-a8f9-99fe92f35492/roref.pdf
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_445552040c124857af22839424668230.pdf?index=true
    • http://xidozuk.rf.gd/93079394529.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_off0000ed62.bin
e82219531a92a1b06a816d8a71ed4ae3088eacb13227f513b6ed045762489f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 5264 bytes
font_01_sfnt_off0000ff37.bin
3a61b47d92aedeed35064f335b687cda429a1825b5008af7fa6dc64879fe8f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 11864 bytes

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