Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87c868f93333d48…

MALICIOUS

PDF

69.4 KB Created: 2021-02-24 10:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6d6fc19edd17966c5b87c9b42d545431 SHA-1: 71c720537b4c4f8416ebe398b7bc681da73ea6be SHA-256: b87c868f93333d48d8c146bdfa54856a5cdbc5fe870dfa538ceb22150ad65afa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, strongly suggesting a phishing or link-farming campaign. The ClamAV detection and ML classifier further indicate malicious intent, likely related to distributing further malware or leading users to credential harvesting pages. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

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://jottigo.ru/aws?utm_term=english+grammar+exercises+phrasal+verbs+get PDF link annotation
    • http://bionatur.space/el_jinete_de_bronce_pushkinbnipp.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/wipepaxomalisu_vizogenetuk_goxalolara_torasadegije.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/zekavupolex_fobolu_wasamegukunat.pdfIn PDF document text
    • http://persequen.com/29507441542rr7py.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_602952b01dd98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5febb4bac5874.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/ximuxoduxore.pdfIn PDF document text
    • http://reduslimitaly-official.site/roku_ultra_user_guidexpoqi.pdfIn PDF document text
    • http://bivasezi.iblogger.org/alter_ego_b2_plus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601252b4d9611.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/matusodematob.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/paxudigu-tojebaz.pdfIn PDF document text
    • http://ca-management.website/add_canon_mg3520_printer_to_wireless_networkr67n5.pdfIn PDF document text
    • http://vorecan.space/colazione_da_tiffany_itaksjqp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_600bc7fc60bdd.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/5197576.pdfIn PDF document text
    • http://limelusefi.iblogger.org/how_to_train_your_dragon_book_series_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxenubegipus.epizy.com/avira_antivirus_free_2019_full_version.pdfIn PDF document text
    • http://vagilamiporaw.epizy.com/25556379496.pdfIn PDF document text
    • http://digopepu.epizy.com/3789815427.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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 5572 bytes
SHA-256: 0c6067be5b6a7acde2ddf24d810cd135ed41947e0235b69e976aba279d7cdc29
font_01_sfnt_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 11016 bytes
SHA-256: 180e34f678891a4f946de37ac76b89ec9fc0954f70ec5532679261e98cbd9fbe

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