Malicious PDF — malware analysis report

Static analysis result for SHA-256 8522a8c345c46028…

MALICIOUS

PDF

68.3 KB Created: 2021-02-17 23:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e7e4e4e70f4e1041358e4f80a99dd328 SHA-1: e4fdb1c19daacaf643cce239804f5bb3631b9520 SHA-256: 8522a8c345c460286a37ce7f3289fc4abb0f7bfc6fea38d9d1b52b1e4ef792fb
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a PDF link farm. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=among+the+hidden+ar+answers PDF link annotation
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/168653.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/9jgicjg/doodle_jump_download_chrome.pdfIn PDF document text
    • http://idealicait.website/litutoruo1un.pdfIn PDF document text
    • http://goromeo.club/steam_api._dll_pes_2016_32_bitfcgqd.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/5idjfge/funny_hashtags_for_weddings_free.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/f031a.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/euP9mhi/tiktok_news_today_update.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/cgqOifI/gusogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tesapibebujep/72966066334.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/possessive_adjectives_french_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/71477281541.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/67746958179.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/dobubenewozop.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/shrimad_bhagwat_geeta_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/bojezisedutijuzezowesojos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 5076 bytes
SHA-256: 5cd9c15ee2c9fc6c4f60aec26b5e7d195bd472c0c283de43ff04395d86f813f9
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 9948 bytes
SHA-256: 465825e51ca8fc91b83dbdb77e62ab7195674722c7b27135b618f681ec9f1a30
font_02_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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