Malicious PDF — malware analysis report

Static analysis result for SHA-256 574719a736bb0fe1…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 15:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a9734cd4e4702db2c9a2726fd425c654 SHA-1: 7452c841153cec61007b46ef60ba948bbe605977 SHA-256: 574719a736bb0fe197f3a779c9a51721c55a26310d5da10252e8dcc4fbd658d4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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
  • 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://vilenefex.ru/123?utm_term=bootable+ubuntu+usb+stick PDF link annotation
    • http://sabowupab.iblogger.org/english_alphabet_files.pdfIn PDF document text
    • http://gigojosok.22web.org/tipos_de_expresion_oral_ejemplos.pdfIn PDF document text
    • http://gowitobo.iblogger.org/xirujabewubiwezo.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/zifitexajuvawetifupemur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_6032c7d6e5ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_6039b4ecd0b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_6017620e656df.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/nijusufin.pdfIn PDF document text
    • http://recepty-dd.info/mitireforuvurzyll.pdfIn PDF document text
    • http://xolixelov.22web.org/perimeter_of_triangle_worksheet.pdfIn PDF document text
    • http://rankingcoach-apps.com/computer_network_definitionexl8o.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/nuwunebokivizege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5ffabd9c3e16d.pdfIn PDF document text
    • http://dalkomis.website/runaxozojoguxedimafirapary3pla.pdfIn PDF document text
    • http://centerbluebadge.com/scratch_2_flappy_bird_tutorial8onnr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejokuze.rf.gd/62160442629.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/googly_audio_songs_kannada.pdfIn PDF document text
    • http://lisodibediv.epizy.com/76773526199.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/ziramigibavuxedoge.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/what_does_the_firmament_of_heaven_mean.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 4952 bytes
SHA-256: d01e8b0ad135a530ab82eec193cb26de85be55e0e423bd28ce336b4840d2839c
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10676 bytes
SHA-256: ca699a3e78f6fc44e6b6d83812f734cfb12535216007226fc5d107fff3cc110f
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 16092 bytes
SHA-256: 6a435b3896ddcd79d4a1654faec39833a1e091b8139a10f4c5bc3bd74b9b9cd3

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