Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d0597f5e512c4a…

MALICIOUS

PDF

63.0 KB Created: 2020-12-03 01:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f8397f111171aa893139796a41971e26 SHA-1: 96cd3ee63cb375d49ce9b6d69415b02979e98cd0 SHA-256: 99d0597f5e512c4ab0df3e82d15d76e6900affed8e9722d047141b21d8991b44
252 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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
  • 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://traffmen.ru/strik?utm_term=tucker+county+wv+assessor In PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/gokidojisepurumonezo.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/22cc9905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5f9c68585a017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f8fc572a5bbc.pdfIn PDF document text
    • https://lajakobu.weebly.com/uploads/1/3/4/5/134599687/d358b2ba314ca39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fab7a53aab11.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/43ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_5fbbfa96e6172.pdfIn PDF document text
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/jazuziza.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/930e90590.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/golujekeposep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d11009-97f6-4cce-8e85-fddd6588ffb7/luwusekigo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e44e92c50b1a1e7784dc/t/5fc37f562dd96f59185ae4b8/1606647639327/91941286184.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10304b8467722f1d4df02/t/5fc43247145a8629dc355b31/1606693448318/solar_laptop_charger.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd03a68bc8713fe6fe9872/1606222759423/5759053696.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 5028 bytes
SHA-256: f5438e9f2db2715ab52766f3248b62031ba740a09d2f6b5a69de27d648c62769
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 10260 bytes
SHA-256: ef35b934011144eebc38c4b9a03009112f23c29ac93e81eae3fb2bee47b1ad08

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