Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc7fd9ee1d47cfc…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 08:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a4d8c662b2f9914d1cf9684dd3ee3da9 SHA-1: 5515f953d2b57693bcd71c9a4498b32c16587c8b SHA-256: edc7fd9ee1d47cfc1cc09d9642a2e26a66de10cb2527ce5a25e246ec7cd6ba08
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://jacksth.ru/strik?utm_term=george+foreman+electric+bbq+grill+cover PDF link annotation
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/23348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_60486c98aaaaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5ff2812f971b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_6013f61bf1122.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/jukotusolosa_fotaxufiri_nuzodaletakeji_susolavubaj.pdfIn PDF document text
    • https://vesitunerenos.weebly.com/uploads/1/3/5/3/135338192/06acf3ea62ff628.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/xibimiwana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_7d32f17cb13243c191dc18324e7b43b7.pdf?index=trueIn PDF document text
    • https://82e2731d-caa1-483e-98f9-8716417fe63a.filesusr.com/ugd/5ecadc_da0aa3780f7e4b4d86b7fad337296b71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/828cc139-535d-4cf2-ae93-5ca12473ca4a/post_office_account_number_digits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c36856f-03d5-4766-a0d2-701c7a632004/41540883516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff7fa55-5bfa-4dfa-9b72-4565e0761098/cnbc_stock_market_live_updates_friday.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/wepanigut.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/whats_a_good_electric_skillet.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_9b50e3cf096d4d6b81313b61ea7be29c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/add_multiple_rows_to_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1974aee1-c7b0-4513-a2d0-df68d87d7a21/nujilinoraralinuwolabego.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/kazepunanaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/nisomonifutexifuviwojig.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 5380 bytes
SHA-256: f7616431ce7e9030504366c63f3843656a6050a48099b211847052ddb8c5f54c
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 11856 bytes
SHA-256: adcf13f5e83e57bd55f7e2173911c44acd8c90f7536824811e6a2cd50583b373

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