Malicious PDF — malware analysis report

Static analysis result for SHA-256 c100078fb9171b2e…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 23:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4c6ea2425f6c6f98cd532d5a72ecf617 SHA-1: 5c3a9a970d29b6ff23d406a07be1a4bd9ee04366 SHA-256: c100078fb9171b2e68cd831074785456ad3d1178563be8bbd244abbfbc788fdf
194 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to disposable hosting, and a visual download button lure. The primary URL suggests a phishing attempt to trick users into downloading a fake PDF reader. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+acrobat+pdf+reader+8 PDF link annotation
    • http://topmassage.net/88450968707plh94.pdfIn PDF document text
    • https://rotowoboragidak.weebly.com/uploads/1/3/4/5/134508058/sumebovexuli_lumiwuzinez.pdfIn PDF document text
    • http://newsportstechnology.ru/los_juegos_del_hambre_en_llamas_pelisplusjjb9a.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/xarube.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/PCzjhhb/fimulilip.pdfIn PDF document text
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/dolikobe_burixaliwawe_nozuzabig_lebimofevako.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/pivuko-rovud-gupadegiguzimot-pegotijuzumego.pdfIn PDF document text
    • https://cdn.sqhk.co/disanefamu/Riejhpc/zombie_2_movie_disney_cast.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/topamopob.pdfIn PDF document text
    • http://vovality.club/window.location.href_not_working_in_android_webviewmm4xd.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ihheCK8/vozabamatunomimunivo.pdfIn PDF document text
    • http://my-favshope.online/el_hombre_mas_rico_de_babiloniawjdv7.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/ceef3.pdfIn PDF document text
    • https://tilifopufobi.weebly.com/uploads/1/3/6/0/136049844/222977.pdfIn PDF document text
    • https://magifoxokepo.weebly.com/uploads/1/3/6/0/136053300/botuseboxofejoxefo.pdfIn PDF document text
    • http://homebig.space/prison_break_trke_dublaj_3._sezon_izlegg8z5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/77574747374.pdfIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_6228257a024e42c594e10a8fbc911ee9.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_78bfecef7fcf460eaea06a7656c8a973.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/edw_enterprise_data_warehouse_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/warm_bodies_full_movie_in_hindi_download_480p_filmywap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5396 bytes
SHA-256: 7ce62b14ce43a14ea9469016af91b6383616421d822315314e91d6c013fbbd0b
font_01_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 10936 bytes
SHA-256: 5ec4f556a9c171180f95704d53b2732948faf982fd053260af9a1e6db24d6237