Malicious PDF — malware analysis report

Static analysis result for SHA-256 450488268d3a096a…

MALICIOUS

PDF

73.9 KB Created: 2021-05-28 23:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d6eff0c680b30198c6032e027573f20 SHA-1: c6b8f41edfb7a1bece14b8789a211270859c838d SHA-256: 450488268d3a096acf6293c0561bb5145395bc003ec17ea0dcf1939379e567fa
186 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. 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 0.9999

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/123?utm_term=homework+sheet+template+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381085/normal_606ae69cee9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_6061a8852c349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_6041678d5d019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe28534aa75d.pdfIn PDF document text
    • https://nigixugibozat.weebly.com/uploads/1/3/5/3/135305984/gopotopexari-pisimanegepe.pdfIn PDF document text
    • https://wigegavevimuxak.weebly.com/uploads/1/3/4/1/134132972/05b817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413457/normal_60065c891a26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_6026379d6ad3a.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/bb72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448538/normal_6008c7772bcc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_6005ed55ce772.pdfIn PDF document text
    • https://lawepisofav.weebly.com/uploads/1/3/4/4/134473025/e20f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fddb0e7e5e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_601f0716676f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_603ce17ac530c.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/8752024.pdfIn PDF document text
    • https://bebejumupetokox.weebly.com/uploads/1/3/4/5/134513190/7382268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_6001c12e77c69.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_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 5316 bytes
SHA-256: 67557c614d78ab856571eae03faf21d657c4832d5ba134629864f2ef5b228d92
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 10164 bytes
SHA-256: 2e24f6130b0c7e423397b9275e0cb720b1dba4970819b52cc8e56fe0a6574dfb

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