Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea080383c8993843…

MALICIOUS

PDF

98.5 KB Created: 2021-03-05 14:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b4a7b0599cb1b34ec24f9cb1ac79256 SHA-1: dbc745ce577f6985d1674974f36b5961e4e5d685 SHA-256: ea080383c8993843bdc1a0e9929e408088892fc4b9217c7a9e19ac8e3438cb74
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a significant number of external links, many pointing to disposable hosting, consistent with SEO spam or link farm techniques. The presence of these links suggests an attempt to direct users to external resources, potentially for phishing or malware distribution.

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://leonvi.ru/wix?keyword=african+proverbs+from+things+fall+apart PDF link annotation
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/fejodupew.pdfIn PDF document text
    • https://norotenivepele.weebly.com/uploads/1/3/4/0/134042349/4236638.pdfIn PDF document text
    • http://jududijixemuvov.22web.org/android_one_redmi_note_4x_xda.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/spring_boot_jdbctemplate_pagination.pdfIn PDF document text
    • http://vabetovopux.66ghz.com/vyprvpn_login_information.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibenovelu.epizy.com/calcutta_university_registration_form.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_410ddcd84c764803acd4d0e4d69a91f3.pdf?index=trueIn PDF document text
    • http://ziwilud.epizy.com/annotation_edit_manual.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_5946ddb844c44366afc9e3bc1519404d.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_1aeba8d2bcfe4457aabcd0a817435a73.pdf?index=trueIn PDF document text
    • http://pusagulubuke.rf.gd/laxaxiwigariv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35c5521-d425-411c-8257-7ebfb2b8e81f/99823350725.pdfIn PDF document text
    • http://ronirito.rf.gd/99766267078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d17320c-d3e6-4d74-81e6-6d027e211a83/list_of_account_classification.pdfIn PDF document text
    • http://xesovukefezusag.rf.gd/71330982346.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_ad2db5bbb6a74c578881c3741156ff67.pdf?index=trueIn PDF document text
    • http://kigitom.epizy.com/philips_voice_tracer_audio_recorder_dvt1150_review.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_11bd51d38b25474ca0a7f2de9a9a6872.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_6a46c528a80541d5b156b9d3938bac72.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 5620 bytes
SHA-256: ab1ea731d286f72089ee8bbcb91b30ba257e9435f098415a776e8893d2f1e2c5
font_01_sfnt_off00014928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14928 6616 bytes
SHA-256: f35c7bf972787a8985cc4997e218cca3a762b065a34612f3edc217ea88f96405
font_02_sfnt_off0001599d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599D 10172 bytes
SHA-256: b6cab99ad3eaa91d2889d4e2d8deaaaa4cea78b9894d6cc05deda53a79f9bf7c