Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4710cef94a1d98d…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 08:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 367b52d233a7bfcc1f706013369de959 SHA-1: b9252c005deb130da6996c1590e27bbeda63884a SHA-256: c4710cef94a1d98d9edbfad7a389479de60b1ddc82fd28231dac52b44fd14490
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though partially corrupted, indicates a lure related to 'Verbes etre avoir exercices pdf', likely to trick users into visiting malicious sites.

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://gimoguvi.ru/award?keyword=verbes+etre+avoir+exercices+pdf PDF link annotation
    • http://ipatovaalena.ru/when_it_no_longer_hurts_quotesjt7f8.pdfIn PDF document text
    • https://fobamenowukar.weebly.com/uploads/1/3/4/4/134485242/3556961.pdfIn PDF document text
    • http://ita-talia.fun/fonotapebofesaluzodagopebetda4.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/356857.pdfIn PDF document text
    • https://fagoloda.weebly.com/uploads/1/3/4/6/134649735/932c9c060fe60.pdfIn PDF document text
    • http://strapslap.online/wexumagedibupesset.pdfIn PDF document text
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/zevugutavulezel_xupas_pogibilojivufu.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/1841751.pdfIn PDF document text
    • http://yourdesk.website/fiwovinupanejovuvenijix6qqds.pdfIn PDF document text
    • https://xesilowavexaweg.weebly.com/uploads/1/3/4/2/134265648/7674374.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/c9d0ae76-0f5b-4367-adaa-833c88ccb470/baptism_of_holy_spirit_and_fire_meaning.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_478aefb620304554acf825681624dd0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c24b7ff-e03c-42e2-aefc-86b750877a3b/69829806701.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_3ebf5719ae1f4421a64738cf0eb406b4.pdf?index=trueIn 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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 5352 bytes
SHA-256: 74dc418aa424c5bea16c2c3dd0a9818088f2ae07741a005d9cc1facfd9cd331f
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 12664 bytes
SHA-256: 89a0893bb19294edc29ede2b7b9b05c7908fe12a7cf0b7b07ed8f91d25248992

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