Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27497f3517b3dd6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 15:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 714d7d1e708dd063ad574c089bd92a5e SHA-1: b2c2bc1c4732cdc87cbb5fb0cce63c97568f77b4 SHA-256: f27497f3517b3dd63c304afe2b0a0b2dbb7438566c914ebe9b75c0a95ffb7751
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or a distribution mechanism for further malicious content. The presence of a 'Download Now' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to deceive users into downloading harmful files. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=aptitude+question+papers+pdf+download PDF link annotation
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/2537743.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/6731616.pdfIn PDF document text
    • https://pesenulowujef.weebly.com/uploads/1/3/5/3/135325158/1372217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_602eefbe7df7e.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/bavojexis.pdfIn PDF document text
    • http://gratoramaa.website/nuvinuvoxowatoratagyw89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5fc6c12f3868e.pdfIn PDF document text
    • https://zanudega.weebly.com/uploads/1/3/1/1/131164011/gomaxibixovuxemugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_6049ee7d315a8.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/00e11ac5d3ae2c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6047f23fb195f.pdfIn PDF document text
    • https://zupagefu.weebly.com/uploads/1/3/1/0/131070313/4982826.pdfIn PDF document text
    • http://stixlife.info/mikoguwomokadexi3oled.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/5988b551-51df-4e61-8fdb-602e181fadb0/sat_scores_2020_college_board.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/jogazefikutinunuso.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/xemarosavutemuripekinofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05424681-f482-4130-9211-13596e53e161/lemetasofoxadesijenav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b400c64-8332-4fcd-acca-1d4be61426df/raxatorinosalefakevu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/21838693160.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/backdoor_roth_ira_2018_tax_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/jaipuri_bedsheets_combo.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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 5240 bytes
SHA-256: b01c4c1261ed8702e170b5ff045e55255027008f0184d81424db6bb0e19b81d6
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10768 bytes
SHA-256: 6f4c465da92a7ec504f92d713bee2bb9c20a79739f4e5e1fd8196b958273a8ac

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