Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f34f343d31b385…

MALICIOUS

PDF

79.2 KB Created: 2021-03-27 23:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f102c1032bd130c1894b66c0723f4a9f SHA-1: 9b39e5d1622fcee601653b2877e6367103ec71f0 SHA-256: 58f34f343d31b385260cc79486a4c6db63290210b53f8b35936da04416d5e837
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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/award?keyword=free+keto+diet+cookbook+pdf PDF link annotation
    • http://miribut.mywebcommunity.org/ocarina_of_time_songs_on_recorder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6049d3494d14e.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/decision_tree_in_system_analysis_and_design.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/nidowobokod-foregos.pdfIn PDF document text
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/fital-jesiguzuso.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/what_is_good_character_development.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_60581848ad2e8.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/1505739.pdfIn PDF document text
    • https://nuwosalu.weebly.com/uploads/1/3/4/4/134497214/tofepuf-tojibujutug-bazoximami-wupawunukabu.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/0524dda9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fc89d7c58301.pdfIn PDF document text
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/sologebapipoverejumi.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/pwc_uk_annual_report.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/9d8fab6445ff72.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/maximum_principal_stress_theory_factor_of_safety.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://uploads.strikinglycdn.com/files/9f85436c-887c-4d87-bb87-da0724c1ec55/zudofavowazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5e4bc1-080e-4013-8323-762dc283a913/why_is_it_important_to_know_the_history_of_contemporary_arts_in_the_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2fda8e-0906-492e-b805-deaabdf6575b/niwokoburuxufode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9b9358-649b-417c-a148-47d594bd51bf/girikorawadoruni.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/insulina_apidra_bula.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/patej.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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 4572 bytes
SHA-256: e3a2a694670e426b2587468a1625da71507a96352b70d57c1f1a6e3ab4cd51a4
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10592 bytes
SHA-256: 324deb644a2cc3087873f86f7a817bea9779cb6abaed77b173f8dc0256622fb4
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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