Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6679f40b230482…

MALICIOUS

PDF

74.3 KB Created: 2021-04-05 05:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 50b51dcb29ee7e95170a22a652e9d5be SHA-1: b2343319f69e96f4f15d19b6d574cd3a26af7ac1 SHA-256: ec6679f40b230482ff0bd458ee7d7817a0662e66b4f1eaf3c828f7b099bbae28
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=appsc+previous+papers+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601744333ee40.pdfIn PDF document text
    • https://cdn.sqhk.co/davunosedepa/idWjiM1/47810941241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_605cbf3289c3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/5Fihjev/talking_bird_toy_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fec20cbeffcd.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/giSNdCv/wabituvi.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/Ip1iahh/30583087143.pdfIn PDF document text
    • http://semasinizitowo.medianewsonline.com/ejercicios_de_movimiento_rectilineo_uniforme_resueltos_3_eso.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/jiaCI09/dinosaurs_world_live.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/systematic_review_and_meta_analysis_book.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/chjgihd/world_war_3_movies_imdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligiwekuxote.myartsonline.com/ipod_classic_5th_generation_30gb_specs.pdfIn PDF document text
    • http://xokiserigebalid.rf.gd/32177980358.pdfIn PDF document text
    • http://vojasokizew.epizy.com/52825069288.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/29802022045.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/loving_someone_with_anxiety_book.pdfIn PDF document text
    • http://wokidomogu.onlinewebshop.net/barycentre_terminale_c.pdfIn PDF document text
    • http://wurifikag.rf.gd/24785011014.pdfIn PDF document text
    • http://folujas.epizy.com/83731159406.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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 5372 bytes
SHA-256: 6f16b69029d7989789b484924169f2c052dcc8c157bc552d84dbb6cbc901d536
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10424 bytes
SHA-256: 7e57fa0475e3adbbee974044ce33e6701331c15387dc6ef2ab73e496e94b1513
font_02_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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