Malicious PDF — malware analysis report

Static analysis result for SHA-256 817e1dfe6c7ccedc…

MALICIOUS

PDF

72.4 KB Created: 2020-11-13 01:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4fe732de3fba52e0681de7f99be243c0 SHA-1: d0d3a2acb2d35bf7d6593b4eccdbc478d4c9480d SHA-256: 817e1dfe6c7ccedc05db1ec4c09c7e7d8e8f709bb372b259c1c57a6ed107d027
156 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. 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
  • 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://trafffe.ru/123?utm_term=vfw+fish+fry+near+me+2019 PDF link annotation
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/d0ae5d7.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/7038732a-6db9-4fb9-8cbc-55e4df86b86c/wejabarexuronidupaboxaga.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/xejosutug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f16c91-c976-4a1c-9ded-506d730e2777/guxabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d74332-fc47-4737-874d-d9ed5143c579/57172708757.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/kinesiology_courses_tamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e1bb16-c191-4692-943a-9e3e74ced54f/dokisadutur.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/northern_railway_reservation_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/west_stokes_high_school_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac32dc5-6e0b-4f2c-8e05-02f30e530029/the_ultimate_guide_to_sat_grammar_4th.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/bronto_saddle_platform.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_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 5616 bytes
SHA-256: 1313db8a7fff03589a0f3a204561976bdb4c3412e6a532e11864ac514f4b21ab
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 11084 bytes
SHA-256: c30fe1801d963aa02fc8ceecb22b417bfe0c31276845d1ecb18ec4dc3031cd2d
font_02_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16168 bytes
SHA-256: 8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9

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