Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ac3cdb1340921c…

MALICIOUS

PDF

73.5 KB Created: 2021-02-21 18:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09164b32245862f6d74d4b66077f3032 SHA-1: 966b618e5ce178cf6c9cf730650f64bc3e02f688 SHA-256: 90ac3cdb1340921c3a4f1770ddcaf225a75d137c7598aa0ef2926057fb6b2f16
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or phishing attempt, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/123?utm_term=computer+operator+interview+questions+and+answers+pdf+in+hindi PDF link annotation
    • http://moitender.org/health_canada_canadian_drinking_water_quality_guidelinesnp5qd.pdfIn PDF document text
    • http://d-youtube.com/moises_los_10_mandamientos_serie7un7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488139/normal_5fda9807d00d3.pdfIn PDF document text
    • http://knitfqph.site/15011592049xxnn7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5fd06327d2959.pdfIn PDF document text
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/8796260.pdfIn PDF document text
    • http://maewallace.com/mathematics_3000_secondary_5_answersdlwty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_600cf48a09499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5fcb076d60c67.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/numerumubag2tk9z.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/vabedafozo/bahubali_dj_songs_free_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/implosion_full_version_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/sony_bravia_4k_hdr_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/faxadabosuxuzik.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/96928952344.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/53968716522.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/xofozufuwunesifuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/23204331125.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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 5432 bytes
SHA-256: 7eaf651d20e41456dbf2fbeb36ead7dc81ab5babf4b5f20ea0c6b6ff858f2a58
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10364 bytes
SHA-256: 1dd87f06ce02d8eb66d4e8dcfcea0b01c32e483eecd853742125084ce9a46d56

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