Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b56a154b8c3f056…

MALICIOUS

PDF

82.6 KB Created: 2021-04-03 21:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d3566c1250c9be4f534685a69cabaf6b SHA-1: 085ba459f7296847b7ae2923eb2bf48bcfe08dc6 SHA-256: 7b56a154b8c3f05697dd069d3e19088baab97af5af56d5d116ff095be2314209
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV also flagged this file as malicious. The document body appears to be garbled, but the presence of URLs suggests an attempt to direct users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 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.
  • 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://dafemum.ru/strik?utm_term=sword+art+online+fatal+bullet+complete+edition+xbox In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_603d60b3924ad.pdfIn PDF document text
    • http://jiwujut.iblogger.org/contractor_health_and_safety_performance_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6046c6561e363.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/jorugetaganosi.pdfIn PDF document text
    • http://kunutudusoxa.mywebcommunity.org/advertisement_effectiveness_project.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wupoxinow.rf.gd/how_to_record_pc_gameplay_with_elgato_game_capture_hd.pdfIn PDF document text
    • http://xalixonawi.atwebpages.com/solidworks_visualize_2020_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/lozafo.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/solucion_isotonica_hipertonica_e_hipotonica.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_b867421dcb7a4058ac8e4b130bc94e65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/377989866.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/mathematica_9_mac.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_9c4a8c6cda73487b9724e79cb84cd1ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sivanira/bangladesh_vs_pakistan_2019_pitch_report.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/13663280852.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/wupamolowutedi.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/export_whatsapp_backup_from_icloud_to_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/tegaxuvorigukufo.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/cuanto_mide_el_metro_cuadrado.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/80257328185.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/dajomozetosufojanat.pdfIn PDF document text
    • http://diveruwafulebes.epizy.com/wings_of_fire_book_4_graphic_novel_pages.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_42794ac125e046cb8d620a081d124d88.pdf?index=trueIn PDF document text
    • http://pebodupa.rf.gd/how_do_you_fix_the_hands_on_a_clock.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 5264 bytes
SHA-256: 33d8ead326138fe3404ea5cf248f29ba9b3372b0a320cfbbf44c570e1a8a507f
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 5408 bytes
SHA-256: f2a99c65222b199f1a158792c4fded8f988b416c783b4e25deb18c62873467db
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11444 bytes
SHA-256: 1d0e74618d5c3c8eeecc69d5aae524ebb51f646233180779a8a4989241b9d71f
font_03_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f