Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a207d8a23883d6a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-09 10:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53d5da0c6fdb6a21dee9b1b83681d38c SHA-1: 5c051143349da93f1f7aeee3249ba004afa09c00 SHA-256: 2a207d8a23883d6a47617cff09359aecc96048fef9ada0e67a2a922f9fc1dcf0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/123?utm_term=a+news+report+on+flood PDF link annotation
    • https://dowanudamedi.weebly.com/uploads/1/3/1/3/131398164/9d5bb15b1f1a.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/tesejug.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/6cbd8b10c35.pdfIn PDF document text
    • http://fefikaniki.22web.org/tissot_prc200_chronograph_manual.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/vanatul/julius_caesar_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5fad40e-1173-4cdd-8792-34a5834b75f1/96208905605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff9c906-944c-4542-88bb-90f9235bde0e/xojivefisudamuz.pdfIn PDF document text
    • http://bexamunexena.rf.gd/83317844103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1b9dc7-53f9-4063-8fb0-31590288c84c/24878339159.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tuvixadini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d910b85-71bc-4568-aa10-951f4263d74c/52237781336.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/cequent_performance_products_mosinee_wi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc38e02-5b29-4547-aa54-683a66f1c736/tizepesopidodaves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbeeba6-d340-490b-af86-bbf080734f8f/56302627126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e78a3a-4dbb-4770-b3c3-4eb684a89180/1997_kawasaki_prairie_400_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4de0ee-b965-419f-84d7-8fb915dce4b2/which_country_have_the_highest_gdp_in_africa.pdfIn PDF document text
    • http://zovogimobidel.rf.gd/what_does_the_expression_double_down_mean.pdfIn PDF document text
    • http://nelekagudoper.rf.gd/larebinixegegoja.pdfIn PDF document text
    • http://sizuzupapefapo.epizy.com/negative_numbers_revision_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82e2fb6-276b-4120-be5a-67395126c651/microeconomics_textbook_class_12.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_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 4904 bytes
SHA-256: a5e31683fbb45f9dbf9b42bf9f7388d0a7d556ea4e9a4ddacb649dbf632e109e
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 10808 bytes
SHA-256: 8cd2b5a7e88c942e29aad7ce8e74bb271be76c41bd39c4a0e62a6a0877385e35

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