Malicious PDF — malware analysis report

Static analysis result for SHA-256 04331fc1492c045c…

MALICIOUS

PDF

68.1 KB Created: 2021-01-07 23:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d9cfd04363decfa7437e0177cfb18d69 SHA-1: 26d392efa5bbec986858b8fe5383816d9b970469 SHA-256: 04331fc1492c045cbb9857c0849be4ec7671695fe8df759884ccacfa4cb6c2af
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffnew.ru/123?utm_term=marion+county+tn+most+wanted+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f8e3241f32f8.pdfIn PDF document text
    • https://vojelapavefiga.weebly.com/uploads/1/3/4/3/134308780/wetipufeputuponeru.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/5859134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_5fb7479e8b1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fc56867d77e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8b65d83d61d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_5fc696bdab424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5ff6593c6f06f.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/xoneraselovege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_5fbbdf3f405d9.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://uploads.strikinglycdn.com/files/f75d071f-2ec6-4049-b8af-f871ce81cc19/deep_learning_adaptive_computation_and_machine_learning_series_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/aol_outgoing_email_settings_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a81945e-101e-484b-b1c5-3c4bc2cbb02b/fedufupenupak.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_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 5408 bytes
SHA-256: 5733e5820f5b41013a1e50305cc0926a1e1ef8f20dc8c8f396f9b1cc68cc9570
font_01_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 10372 bytes
SHA-256: 8c1bbf4894097529d862504b2ee063ed70c828963b9196dfb849bedf91ee6fc6
font_02_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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