Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebf8bda64046c28…

MALICIOUS

PDF

68.8 KB Created: 2021-02-18 13:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18250ecc8dc6c9b05fc39314bd477af0 SHA-1: 13cc206852fae53577e503bd052cf62e1d528c82 SHA-256: eebf8bda64046c28dc704bb99a582c8612371e86706746f19e2a7d51df8de49f
156 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 0.9996

Heuristics 5

  • 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.
  • 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://jottigo.ru/wix?keyword=letter+folding+machine+nz PDF link annotation
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/872470820e69.pdfIn PDF document text
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/9c385be.pdfIn PDF document text
    • http://com-signto5.xyz/dilosowufefuzubusazibax2hqh.pdfIn PDF document text
    • http://medicinfo.online/vk_publications_accountancy_class_12_solutionsby18s.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/JBMibjb/losasajesetufij.pdfIn PDF document text
    • http://ueuniti.xyz/razer_synapse_not_openingjny1m.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/WUD31kv/bonajaviturefedaj.pdfIn PDF document text
    • http://ideaita.fun/bobcat_610_parts_manualo93wy.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/fetakuxoj.pdfIn PDF document text
    • http://dufasobogunojat.22web.org/dadikuronaxutematidi.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/gihi2KR/hepatitis_b_symptoms_child.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/1f43106d.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/fKghzic/jazijorobigopoz.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/xurixado/sponsorship_commitment_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bouree_e_minor_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/kesagubaruxebo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/android_studio_gradle_update_dialog.pdfIn PDF document text
    • http://tikarere.epizy.com/star_spangled_banner_clarinet_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/fimazoredalubaxerev.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/asgore_piano_sheet_music_easy.pdfIn PDF document text
    • http://denakisewir.epizy.com/cambridge_primary_mathematics_learner_s_book.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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 5036 bytes
SHA-256: e39792b97df4c2a662f53fdd837bbd49eb445f6b8e965844969e2c24a9511ef4
font_01_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10144 bytes
SHA-256: d9ff6515030ec0a46cdb69ef23e00868407e28bbb0fd5a1456f65bdd5a28f0f7
font_02_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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