Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a40e22e7e2880…

MALICIOUS

PDF

75.8 KB Created: 2021-03-06 15:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8ef20fbf018b803672db554149503e0 SHA-1: 2176f05d36183e67f4856f8db43d1a8dede738b5 SHA-256: d39a40e22e7e2880a3ffd7d30ae466e2a36f3e90abcbe5d1df1df5c940b5cc66
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of external links and the overall structure suggest an attempt to lure users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=i+have+taken+the+road+less+traveled+quote PDF link annotation
    • https://giliwafe.weebly.com/uploads/1/3/4/0/134016831/b57ce6f9d7585.pdfIn PDF document text
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/c01fb99.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/51c1b0.pdfIn PDF document text
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/wisurujiw-guxemopawupevu-sotumej.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/bajuzufevawo-pejokokilupipof.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/nejijewupanitot.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/rezax.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/letune.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/kuwoti.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/wefinifasoku-kizapuwufipag-dowabitow-xemaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_47353c88d93a4f7f8ceb55dd7804fcf6.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_6ba0c0620b764e70b87e8a3c8741506b.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_9d9a9850bba248ce9afeae24f712cdf7.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_47d11fdc489a4da795321fc8fcc98ac7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levumoduf/adjusting_negative_core_beliefs_worksheet.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_2ee592d889cc42c6a316fecd280d57cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/315259ce-2ec5-4469-9dd5-5141c3a05feb/zebco_202_reel_specs.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_7e377cbe95184af3804d563b6e3d4e87.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_437fa43717a64edd9db634f18f73688b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4df5cd-5a91-4291-a1df-c7a661ad20f8/descriptive_essay_for_grade_7.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_0f6816e03a474343a3ec0edcf019ba8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/fasekoramajo.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_446fc387aa2445849b043b8c98d6eea5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/labupunavumowitedekas.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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 5100 bytes
SHA-256: 2e5da8b46922b58737def7ca9fbc4ef151810a8561d098bbd55e79246cbc9388
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 10396 bytes
SHA-256: fe80c4c9ec1e47ddf5390aeb1317ca503b4e18092d3d027484f488126b266fe0

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