Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae92b19f247828e…

MALICIOUS

PDF

73.1 KB Created: 2021-04-11 17:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dccf61d7d2af29054004e99c49254492 SHA-1: 54877273a1bdc5f9ac1b7b34ee4b80c224ce40b3 SHA-256: 8ae92b19f247828e6eb6e1b7e35082d8fb04121c02bb7e0c8976f6125beccdc7
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 0.9991

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
  • 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://nipisod.ru/strik?utm_term=simplifying+fractions+worksheet+5th+grade+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375698/normal_6005f24f19a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_603e1a8320faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6023f5cc9c173.pdfIn PDF document text
    • http://jubasaxepi.22web.org/jewunidukawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_5fe8401e585b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370268/normal_5fef870832c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5fd7b58da585f.pdfIn PDF document text
    • http://pobasomitiji.22web.org/joseph_prince_family_photos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_601ee268b5591.pdfIn PDF document text
    • http://mifelosilezine.iblogger.org/85430786345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_6014b98c105be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_601257479f897.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/jiguwuzobozobaz/guided_reading_activity_7-_1_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/aramark_uniforms_employment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57188eea-3472-4465-b91f-3b9a79833e63/wajife.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/new_american_standard_study_bible_large_print_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8494b703-770d-4885-bb10-fccbd7887520/vovoradoge.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/98329964675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba4c99a-f085-4975-813f-573891856ee1/gufufema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef02914f-d5da-4f21-b458-1c79917dea9c/levigikezilemonutuxorefo.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/classroom_vocabulary.pdfIn PDF document text
    • http://tesekolunasamo.rf.gd/tozofonebiwolu.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/daisy_powerline_880_owners_manual.pdfIn PDF document text
    • http://bukemexuladorux.epizy.com/capacitor_definition_and_types.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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 6052 bytes
SHA-256: 53a08691faa450a53f5d90840484119ed06defb5a5ee21ca9272333db9fd8fbb
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 10608 bytes
SHA-256: 45b5f748d9f2384a402b3c0bf55b3a470c1ddaa244a2bafdc891cb726ede2298

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