Malicious PDF — malware analysis report

Static analysis result for SHA-256 e300356dde461b54…

MALICIOUS

PDF

71.6 KB Created: 2021-02-07 04:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3ac21abd7f7ab1201f869ae3db9e5859 SHA-1: 921fb2c2d688df0fd612cab8b7c0732c54ef65c7 SHA-256: e300356dde461b544b7343954c8d297a283675628938570e867ad93833256508
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a mechanism for distributing further malicious content. One of the primary external URIs, 'https://jacksth.ru/wb?keyword=formal%20ceremony%20crossword%20clue', appears to be a lure to a website that may host malicious content or phishing pages. No scripts were extracted, but the heuristic firings strongly suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://jacksth.ru/wb?keyword=formal%20ceremony%20crossword%20clue PDF link annotation
    • http://pufegusikozig.22web.org/35693564071.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/gfkiaxh/oxygen_levels_below_90_while_sleeping.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/Z8hdRhd/top_40_songs_2019_radio_1.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/jCVKihm/pijapokelugo.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/befodujugafaf.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/eKzvgjd/clash_of_zombies_heroes_game.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/99cdda4f6acfc.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/i5jbtic/godebax.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://www.daltonmaag.com/In PDF document text
    • http://nelifofufotilep.epizy.com/spandanam_answer_key_2019-_20_first_term.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/17620433122.pdfIn PDF document text
    • http://rotanejepajedef.rf.gd/tanivonamomixexejavaga.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/zilakiwomasegavosede.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/applied_research_and_basic_research.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/43001617188.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/png_building_logo_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/riveku.pdfIn PDF document text
    • http://werekixaw.epizy.com/bed_wars_mod_apk_1._5._10.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/google_drive_error_access_denied.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/fukafatulukexa.pdfIn PDF document text
    • http://diwuvugu.epizy.com/tafuloxesomemefa.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/reporting_dependents_income_on_tax_return.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5C 4988 bytes
SHA-256: 33eef24d908c8667fbef03e8b84e9ebb16cb421307ea8f74d370cf4d7e1a6125
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10540 bytes
SHA-256: 77637518bc4e4a3aac610e1de733d3679c2b28760ea27abbadf35b209ffd6290
font_03_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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