Malicious PDF — malware analysis report

Static analysis result for SHA-256 65872ca983e1c0de…

MALICIOUS

PDF

86.6 KB Created: 2021-04-05 00:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310140653149d11f892ab1de8daabef3 SHA-1: b98c3ec0872d5719d7393de25cc5c02f5633fced SHA-256: 65872ca983e1c0de94d46d873b801f0f87a565a5c55ab57347ab914562be604e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm designed to attract traffic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=chapter+25+nuclear+chemistry+guided+practice+problems+answers
    • http://herss.space/power_wood_carving_tools_harbor_freightqaq10.pdf
    • http://gemofesane.medianewsonline.com/24176195365.pdf
    • http://lollipopa.online/nopadipizinosazi0h3.pdf
    • http://gefosezidubajoz.scienceontheweb.net/zivifivabina.pdf
    • http://misifebofol.mywebcommunity.org/62336632580.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://deweleve.epizy.com/xedovoxedipekeji.pdf
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_2cd4ce90926a4f1fbe293e8a6a1a95b4.pdf?index=true
    • http://povorafolopoxap.epizy.com/campus_security_officer_training_manual.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_897de5299a584a62a5c8160566bfdd7d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40c6fd76-bd67-459b-b03b-ae2fc0d85f1e/lights_out_summer_tour_2020.pdf
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_b9f450bbcba04e4a8350034530de3b80.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a7aa942-1816-4a7d-bc5d-ee040eb3872f/85790350736.pdf
    • https://uploads.strikinglycdn.com/files/b7ac0a71-f4b6-4aeb-bb6f-1d71cb5beca3/how_to_sync_roku_2_xs_remote.pdf
    • https://uploads.strikinglycdn.com/files/21161d42-c84a-4812-b5ef-afea51e48fb5/under_the_dome_full_movie_tamil_dubbed_watch_online.pdf
    • http://nebojemesiwi.atwebpages.com/learning_english_conversation_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/608f9340-c1d2-4d79-9664-873df9412b9d/ingles_basico_de_conversacion.pdf
    • https://uploads.strikinglycdn.com/files/c6b620e7-c4aa-4144-92e7-8418463cce16/what_is_criminal_law_in_healthcare.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_9d7507aad4a94cdf90a8742c0a6718a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/405e29c1-8b34-411f-be89-e376b25e6a7c/41440299665.pdf
    • https://uploads.strikinglycdn.com/files/39f962f3-2507-4e85-b74f-e6dd9ae5ed46/menaxevemogobur.pdf
    • http://jafexobaxe.epizy.com/bunarukajikosidimugiwav.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_74f4a9dca1e64c0f9713d74cfd9a4f8c.pdf?index=true
    • http://fetekovabu.onlinewebshop.net/zerixuku.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_off0000f826.bin
7043fd15633155b56b009fa53e907a8a66a6076437f1ac7e7ee3eaab9548e308		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 5984 bytes
font_01_sfnt_off00010c67.bin
62b97b5caa99c9fcad8f22eea416fd1542df83bc48add2a0b10181ae41b8ed75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 12728 bytes
font_02_sfnt_off000136bd.bin
a77d03d1cc906f861169cd84ec05840ce9bbe58eeeb2cd051b1c6fbeacde9882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 16236 bytes

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