Malicious PDF — malware analysis report

Static analysis result for SHA-256 4783c3aa9f896a91…

MALICIOUS

PDF

68.3 KB Created: 2021-03-28 07:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 05488a567ef4f9e562035ad0c43a70d3 SHA-1: 2083396ffc43d453c23f219f55b34dd5a0c100ac SHA-256: 4783c3aa9f896a9126055318ed0eb3281bc1f7f6ab15500d059d007eda5789cd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and embedded links suggest a social engineering attack.

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=oxford+picture+dictionary+monolingual+english+pdf PDF link annotation
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/2317290.pdfIn PDF document text
    • http://whowill.ru/how_to_reboot_alcatel_one_touch_fierce_25z4fh.pdfIn PDF document text
    • http://bt-management.website/weather_news_report_tagalogqto0v.pdfIn PDF document text
    • http://opssmall.space/the_secret_history_donna_tartt_quotesh1scs.pdfIn PDF document text
    • http://dovazevenujo.22web.org/escala_de_barthel_pami.pdfIn PDF document text
    • http://ighelpcenter.xyz/skyrim_dragon_language_copy_and_pasteip43n.pdfIn PDF document text
    • http://demegudatodura.iblogger.org/the_astonishing_color_of_after.pdfIn PDF document text
    • http://forpost-electrica.ru/kegiwalidojekejupgq9qd.pdfIn PDF document text
    • http://bapitafi.22web.org/10438120408.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/poletopib.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/nokamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekuroveki.rf.gd/jemodebimekaxemur.pdfIn PDF document text
    • http://wewonak.rf.gd/clasificacion_endometriosis_asrm.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/vamoxajusajanilazu.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/55622179144.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/dosakevobejavonufotufojab.pdfIn PDF document text
    • http://zatofax.rf.gd/enigma_otiliei_vol_3.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/how_to_pair_my_skullcandy_earbuds.pdfIn PDF document text
    • http://senapofo.epizy.com/anthropometry_in_architecture.pdfIn PDF document text
    • http://pukuwatisapejo.rf.gd/80086336219.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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 5764 bytes
SHA-256: 97d042a019b878a0bb2ca53839815fa7f0e839a7bd40933388558a7a69d943c9
font_01_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 10364 bytes
SHA-256: 234a91ec7e38a24e6a199ddc79295a3fca326c69fc6f124ad191345f4bd781a6

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