Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55a0f8fcf4ac3ef…

MALICIOUS

PDF

80.1 KB Created: 2021-03-28 21:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ae4f2b42a5740c81cd08c90039241230 SHA-1: 3ce41b95e4af4927f2afc8605206eb80cc225cc2 SHA-256: b55a0f8fcf4ac3ef37105bb598440ae696a0af372bdeb2f4a6246c46b10f98a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one, https://kuzutuzo.ru/strik, appearing to be part of a phishing or malware distribution scheme. The PDF's structure and the presence of many links suggest it acts as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kuzutuzo.ru/strik?utm_term=freud+three+essays+on+the+theory+of+sexuality+standard+edition PDF link annotation
    • http://laxofetiduwi.iblogger.org/supopodufabusawanulera.pdfIn PDF document text
    • http://sozaxasofurem.22web.org/mens_belt_size_guide_cm.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/ihavjjC/metal_can_be_hammered_into_sheets.pdfIn PDF document text
    • http://dujepewowi.22web.org/common_livestock_diseases.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/5jfhdjb/18752988973.pdfIn PDF document text
    • http://divalurumewib.iblogger.org/61148481317.pdfIn PDF document text
    • http://wuvuzijime.22web.org/guideline_stroke_aha_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/gNiaHgd/baybayin_calligraphy_font.pdfIn PDF document text
    • http://daburus.iblogger.org/nidiborasisasidi.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ieBiagc/viwakeguxesidadejepijan.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/VhfvigU/sling_blue_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af3ba5e-620e-4607-a609-62ed0b700ccc/97933471161.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/xopafe.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/33530740805.pdfIn PDF document text
    • http://bireses.rf.gd/english_verbs_word_search.pdfIn PDF document text
    • http://xizaretabopivix.rf.gd/diary_of_a_wimpy_kid_the_long_haul_cast.pdfIn PDF document text
    • http://tasaroje.epizy.com/magazine_article_example.pdfIn PDF document text
    • http://zixugikel.rf.gd/cambridge_past_papers_free.pdfIn PDF document text
    • http://talaxevavilur.rf.gd/49487945631.pdfIn PDF document text
    • http://tuzilegikeponi.rf.gd/60355354056.pdfIn PDF document text
    • http://detapir.rf.gd/calendar_2020_template.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/37531334902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5260185-4596-48eb-b935-dd53c55f2468/zavilewugejabewefagij.pdfIn PDF document text
    • http://sujomux.rf.gd/99042377830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cb5faa-afec-47f8-966d-a4fd7b73b408/manual_de_pedalera_digitech_rp80.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a30c210-0b03-4a1a-90b3-8ab2a6e14d54/getol.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5120 bytes
SHA-256: d4efb82361d26666bd6f9e732b293a970eb4bd78fd992e33c3ae753b4f074cfa
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 11720 bytes
SHA-256: a48c610cce6b6166b62e97bc429d0df4e5b3af5c1432a495d8365742fcd84f3e

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