Malicious PDF — malware analysis report

Static analysis result for SHA-256 e432bf5a6293eb34…

MALICIOUS

PDF

82.3 KB Created: 2021-04-23 12:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d483a95ac13e567f0d2ed17ec7c4b003 SHA-1: 0dcd1989509f33ed4986bf0009edb7aaaaa2833b SHA-256: e432bf5a6293eb3445640143f45d1a44a7c1da603ffbe4a06080f74750510ebe
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+long+should+you+cook+brown+rice+in+a+pressure+cooker In PDF document text
    • http://extrameets.fun/what_is_the_meaning_of_english_as_a_second_languagedtusl.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/6893008.pdfIn PDF document text
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/xojesunijemaxasudowi.pdfIn PDF document text
    • http://workshop-fb.ru/89231363665aa0mv.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/hip_replacement_rehab_exercises.pdfIn PDF document text
    • http://tertov.xyz/39571890723k2fa0.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/21cc65c.pdfIn PDF document text
    • http://myimperfectmomlife.com/biginesisipewideeybwu.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/xixikebuzuxusus.pdfIn PDF document text
    • https://jisokegapusat.weebly.com/uploads/1/3/3/9/133997819/2912011.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/barrel_smoker_plans.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/67303243745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/60832963826.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/when_things_fall_apart_pema_chdrn_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/course_outcomes_of_design_of_machine_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/jardiance_patient_assistance_income_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/sovidomurusoseludiwazivi.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/vowesode.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/theseus_and_the_minotaur_story_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/delete_facebook_activity_log_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/20515230596.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/zojirushi_rice_cooker_service_center.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/82132320204.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/selections_from_the_complete_works_of_swami_vivekananda.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/luduwulixasu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 5692 bytes
SHA-256: 2c89af310100ed729516758a7646752fbaea5ec4cdf8ec1c451767fafaf9eb99
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 11104 bytes
SHA-256: 4b698ff35e8ceca59b6d8f63642edac15962b6472e3b2a4a98789cbdfb79ef3b

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