Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c7a88d5bf0c49f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-13 15:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c63636e09ae97fd73ccefa66f259d37c SHA-1: 742067048c6604ba74f1d7046a5aeabb79b67365 SHA-256: a8c7a88d5bf0c49fc25c5d0e5f3a519422b807961186b3334f9bd6be82f5523d
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely a phishing page or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/strik?utm_term=tnteu+lesson+plan+format+for+computer+science PDF link annotation
    • https://cdn.sqhk.co/zesozote/nUhg6EV/vampires_1998_movie_download.pdfIn PDF document text
    • http://menbp.online/geospring_hybrid_water_heater_partsjjsty.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/cgfhg2r/e-_learning_app_ui_kit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_5fe405d0f1f49.pdfIn PDF document text
    • http://bitcoinchat.fun/the_vampire_diaries_elena_and_damon_dance_feel_so_close_season7juue.pdfIn PDF document text
    • http://getyourscore.info/bekiledotidobokineje3pjdz.pdfIn PDF document text
    • http://ritual-venki.online/mevebuguwudijafunabastvn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_6027a00a946e0.pdfIn PDF document text
    • http://successinyourlif.website/bigemekupiwedowebakubius80y.pdfIn PDF document text
    • http://expressday.online/statistical_machine_learning_methods_theory_and_applicationszyk42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_5fd7dcc07dbda.pdfIn PDF document text
    • http://gprofights.ru/8942614751648pbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_d72c898465ae42b18883d33b15670e68.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_ca24676d4c48454d97e6ef37fd305cca.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_437fa43717a64edd9db634f18f73688b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropi/extern_template_constexpr.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/checklist_document_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/how_to_connect_my_blueparrott_headset_to_my_phone.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_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 5112 bytes
SHA-256: b39f472346b23c14f386cfc102ac800bfeb062566986b117a8cd921722678167
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 10544 bytes
SHA-256: e41772513672cf39702a6d2ae792515ba134e77fa61f5ef399d61629cf2061fd

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