Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1cd2acc187cd4d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-22 21:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d7a0c4d20302fdf15329f93bb5256ab8 SHA-1: e926629e6a8c1fedc3787043fa02de1a8076505c SHA-256: 7a1cd2acc187cd4d9d2eb7f84287d7b779420fa4f9c3f69e259046d2a928d594
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these links, https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/075451dbdb2bf8b.pdf, is part of a mass link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=little+mermaid+clipart+images PDF link annotation
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/075451dbdb2bf8b.pdfIn PDF document text
    • https://wugabatove.weebly.com/uploads/1/3/5/3/135318753/92394b7ad3.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/gafaviwapeg-zopejowumok-sigevavesefuzi.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/2034197.pdfIn PDF document text
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/591409.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/wetijas_witejaromiko_japib_wodol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_604d0222696e1.pdfIn PDF document text
    • https://zexuboru.weebly.com/uploads/1/3/2/6/132683252/84fe4b468a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6046b2306a3cf.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/kowudovilidewa.pdfIn PDF document text
    • https://fegowudabe.weebly.com/uploads/1/3/1/4/131438077/zododiwulivunexerof.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/farowug/vavekezufidaxewofufesisum.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_ee4bb293ec8c474d99a05f9a853c3f5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebenok/nunigajuvukuxoxepa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/s10_v8_conversion_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/annual_report_of_reliance_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/23126315182.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/fawoworabivewenaxejotufaw.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/impella_cp_insertion_post_test_answers.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_d37eb42f679640c2af37717526afeec5.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_fbfd1ce86a16413c91f471e62925ea16.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_cdf1c91e64be4fe9a0846be4194c0c82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/90996513933.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 5332 bytes
SHA-256: 9411c3c924d635e272bdb99c9e90739fb2d774406cfe293ca07bafb0337c3a80
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10620 bytes
SHA-256: 98e880448b922ed8b4d4ea01b386515503b719945fa40b201395879259f0b821

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