Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7947d15f7c61a37…

MALICIOUS

PDF

75.8 KB Created: 2021-01-25 08:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 504e097e02f26b827d05f43c1a7b0772 SHA-1: 3cfea946c46d4dc8151b3bb6bbef74db1dde8020 SHA-256: a7947d15f7c61a37042131e2eef20bf9d4cf980454716128c1141a2ed9393c34
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a link to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/aws?utm_term=backup+database+with+format+sql+server+2008', suggest an attempt to direct users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to PDF creation and a subject line that may serve as a lure.

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 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.
  • 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://crophysi.ru/aws?utm_term=backup+database+with+format+sql+server+2008 In PDF document text
    • http://copyrighthelpbusiness.net/57216194865vi0nr.pdfIn PDF document text
    • http://logmeinnow.xyz/4344966645495hu4.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/nuril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd65607ea695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fcf44b79935f.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/degak_wesinaduruve.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/19307531231.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/lovuzumaletor-zisaxidaze-puwib-guvosixe.pdfIn PDF document text
    • https://nonaparipito.weebly.com/uploads/1/3/4/2/134265999/torunidukerenorad.pdfIn PDF document text
    • https://jalebipozufi.weebly.com/uploads/1/3/5/3/135320073/6256361.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/snapchat_emoji_smiley_face_with_heartsricpp.pdfIn PDF document text
    • http://yozi.store/reebok_football_referee_shoesljqos.pdfIn PDF document text
    • http://yesitalia.fun/20794443134utssx.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/a1a970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://nijetazum.epizy.com/1661698925.pdfIn PDF document text
    • http://jifobobaganut.epizy.com/sufepafazapugipaxap.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/38780350457.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/baginafox.pdfIn PDF document text
    • http://dixuzudes.epizy.com/xikinedapaza.pdfIn PDF document text
    • http://nadalapaxizo.epizy.com/tuvopawexusogexakura.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 6396 bytes
SHA-256: b8d6c55df50eaa16d22e29967f6f6f1c20f968b1365e9fe3f490bc5c5f877b6f
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 6148 bytes
SHA-256: be38186c9256ba0e64b07d34cca2e63b176d3ffd182ae4667a642b503e748fe0
font_02_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10764 bytes
SHA-256: ed76b34c445ca4d08374dbafc4104f8288ff406e95a97f549ef7faa2bc5bac55

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