Malicious PDF — malware analysis report

Static analysis result for SHA-256 444bf6748868bf47…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 14:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9c3e5528bafde087acc950be803b358 SHA-1: b77e891a06f30be5c5f9371065a99c40b86da049 SHA-256: 444bf6748868bf475e76037f61d71cddd942315492c824d19071a65d2cc439cf
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://jottigo.ru/award?keyword=pdf+blockchain+technology PDF link annotation
    • http://avit0.pro/arangodb_tutorialceum8.pdfIn PDF document text
    • http://afracheat8.xyz/18753731004qavgl.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/important_constitutional_amendments.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410956/normal_5fe3118db0a3f.pdfIn PDF document text
    • https://cdn.sqhk.co/limexofure/5jjP2ii/gevibogoxugavudajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_6041de828651e.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/the_lion_and_the_mouse_fable.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/56623160686.pdfIn PDF document text
    • http://razvivatel.blog/download_adobe_flash_professional_cc5favo.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/3024173111.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/fjfgiih/kepavub.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/what_is_the_dominant_theme_of_the_yellow_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/dKzhgQJ/43598834099.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/4Ukgcjj/rojafirefimozimur.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/how_do_i_empty_a_brother_waste_toner_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_602ed2662d28e.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/dijjfcF/jumpstart_kindergarten_1994_wiki.pdfIn PDF document text
    • http://nibelv.xyz/zekabamemosokaviv9gdha.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/phrasal_verbs_spanishdict.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_49750acd9124477289dd8b288d5a9101.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_9395a56114c44c348dac694dfb9de29d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5316 bytes
SHA-256: f70b76a3a59ca5fc2f9226592aca542f14ac2e6faa182b0487a81753d2125f8e
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10596 bytes
SHA-256: 4021f60a7863d2b8691d2c0a7a4a66e86588c58be9a1df30ddbedf6f6db3d169

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