Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6fd7926dac067b…

MALICIOUS

PDF

86.6 KB Created: 2021-04-02 17:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa09cf76d61741e24e4957cb45ebc06a SHA-1: 0861182dc846610ddce3248e488b00e053c8c95c SHA-256: 7d6fd7926dac067b5c5d34119dc02cc147919502ae6a47cb0a352b31e6b5f08d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=arduino+projects+with+code+pdf PDF link annotation
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/39699.pdfIn PDF document text
    • http://bakofutemuxasog.iblogger.org/bhagavad_gita_chapter_18_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/bjhiijj/6558864439.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/469498.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/gegd6he/inspiring_stories_of_covid_warriors.pdfIn PDF document text
    • https://dagagiketilijo.weebly.com/uploads/1/3/4/3/134312633/c5c6a32.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/8525753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/levumoduf/80961305802.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_016ab9e09bfe45eb9ed9e8d8495a5d0d.pdf?index=trueIn PDF document text
    • http://kalotiwinilobiw.epizy.com/samsung_smart_tv_internet_browser.pdfIn PDF document text
    • http://bulagim.epizy.com/34072430734.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_d2d54816b85e4566af761cbd297cbb90.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_ca4259d831c4470b91ce1751c042d2f3.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_bc8bec7437524e3482a63e1ea3084a4f.pdf?index=trueIn PDF document text
    • http://jatoxat.atwebpages.com/business_description_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/powerpoint_template_design_for_church.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/80271124697.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 5040 bytes
SHA-256: c9a5c836a393632e62821d6d7d7de7ee7e4770194d8e7abc52c5cf7517128b45
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10884 bytes
SHA-256: 72e7f804e87cae665d230f3efa682172e994e5734de3ecf3661adcde33ea387b
font_02_sfnt_off00013f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F20 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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