Malicious PDF — malware analysis report

Static analysis result for SHA-256 da38aac697964b6d…

MALICIOUS

PDF

116.6 KB Created: 2020-12-06 02:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 13bd87777edee3d9ff971d58680c8604 SHA-1: d8263dec5dac26dd32c834f1e9e523bf99c19bb7 SHA-256: da38aac697964b6dcb1ae372db16d1c4db8cf96b40f8976ca219ac4b67e7c3ff
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=bony+fish+internal+diagram In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fb7bb7a12096.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/lanaxutodi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fc44530bf563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_5fbdf075002d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f87b097aec1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5f9ee4ecebaf7.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/vorukekox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456989/normal_5fa6a13d4b06c.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://static1.squarespace.com/static/5fc5996dc6d9645836420577/t/5fc6e8850623334b0c512e95/1606871176137/74450318594.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf572c4e98326c02079a45/1606375213844/night_owl_extreme_hd_wired_security_system_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfeae1af5bf52c32792e3/1606221487153/82773319286.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_off00017e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E53 5260 bytes
SHA-256: d1e193c4305dfb68c00b583fb33ceca14e28006b151242b6eb68f8d719b7971e
font_01_sfnt_off0001900e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1900E 11960 bytes
SHA-256: 607d517248dc038d83a64221f93dad1a1898ec40d33b353c863015733d826795
font_02_sfnt_off0001b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B75B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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