Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9d1b8b1ac6fb49…

MALICIOUS

PDF

78.8 KB Created: 2021-05-28 09:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c05892845105a17836a02a0580d0bdad SHA-1: b749e4876efe22a3ea74c0f9a43976111c9c5625 SHA-256: ca9d1b8b1ac6fb4938d09648070fb8463a5485f74cfa367f2a0bc88316690bf8
164 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 an urgency-based 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 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dugedepap.ru/123?utm_term=divetelact+feeding+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5ff4c639d3b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6011fc434339a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_602f24d9e77c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fdd18fd46afe.pdfIn PDF document text
    • https://werafapotavide.weebly.com/uploads/1/3/0/9/130969473/nefiporebu_kanatenigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_6044ff2b5de96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fd789f9710b3.pdfIn PDF document text
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/7542253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_6026545da030b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_600a67cd07171.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fcbd92187b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fd5fac261994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5ffd828b6e600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_605a70488890f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_606d5dccf170c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_603902dec2f74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_602e409494012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_6048337a03b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475196/normal_5fe5b0f641084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601e65f8a9ba3.pdfIn PDF document text
    • https://gesusetinor.weebly.com/uploads/1/3/4/6/134685025/werujij-folutusape-zonotuvov.pdfIn PDF document text
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/jawonuvilulaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 4972 bytes
SHA-256: 06237f9aa05c4fb0ed65d1a9bf89ec7a0d9caeeac3a1c4a900fad683654213f3
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 10740 bytes
SHA-256: 23f5cafa5583207a49d2336a086a8b27b73d52fec416eac4b3ad932232352923

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