Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ebeab96eb8ce2d…

MALICIOUS

PDF

70.6 KB Created: 2021-02-17 20:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e597d2e7ccc2eca01b383e298f89978a SHA-1: b8218eb898de8d9106c8d7b98bd5744b7345d6d9 SHA-256: 43ebeab96eb8ce2d457299e0790bc2305839a072debee95ca6a7cca71a7e2b1d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, with the primary URL being https://leonvi.ru/wix?keyword=spectrum+set+up+limited+mode. This technique is often used to artificially inflate search engine rankings or to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=spectrum+set+up+limited+mode PDF link annotation
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/luligolosib.pdfIn PDF document text
    • http://autoupgrade.website/nobovusaxunijetevedjvnp.pdfIn PDF document text
    • http://wunutomerar.iblogger.org/mapamundi_en_blanco_con_nombres.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/3275213.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/e1hdjfZ/one_punch_man_season_3_anime_lek.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/149443.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/kowaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapureju.epizy.com/aerofoil_nomenclature.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/free_email_signature_template_photoshop.pdfIn PDF document text
    • http://pugavidugipiton.rf.gd/pimimunanojafoda.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/kitikeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/how_to_use_garmin_echomap_95sv.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/29643408367.pdfIn PDF document text
    • http://dodujis.epizy.com/chromatography_experiment_report.pdfIn PDF document text
    • http://tinulelor.rf.gd/88561804007.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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 5112 bytes
SHA-256: 059e16e70373f09ac5cb75eb79b5f2e93604a98588c89a0cb846872bb25c9c23
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10312 bytes
SHA-256: 28b47278246b62483745a9c142e309bccbcd8d5c881ca5a926cee61eb9050d73

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