Malicious PDF — malware analysis report

Static analysis result for SHA-256 047458832a0f5233…

MALICIOUS

PDF

100.1 KB Created: 2021-03-15 05:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77eb7ff0032719ffaf3339ba55929f87 SHA-1: 9d14e5171148856d86645bb55e610c62e438ca8e SHA-256: 047458832a0f52339bea0a69ece3dbc510f6953c60a5dc24935b5a5e3eda2b6d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior.

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://golowaki.ru/wb?keyword=el%20conde%20de%20montecristo%20breve%20resumen PDF link annotation
    • http://fipizilemuwob.medianewsonline.com/81414999181.pdfIn PDF document text
    • http://stankoff.org/51847639892j7p42.pdfIn PDF document text
    • http://boost-shop.xyz/tozikexisas5luqy.pdfIn PDF document text
    • http://instapriz.site/analisis_literario_del_cuento_la_siesta_del_martesl2xo0.pdfIn PDF document text
    • http://buzerudi.22web.org/browning_a500_barrels_sale.pdfIn PDF document text
    • http://organicsss.space/lididoseyypyr.pdfIn PDF document text
    • http://nowtorrentz.com/kenutisfvqa.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/garujiz.pdfIn PDF document text
    • http://wumokejo.iblogger.org/read_180_real_book_stage_c_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povuputuk.epizy.com/35180259553.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/9132007542.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/cartoon_full_movie_in_english.pdfIn PDF document text
    • http://tadiwolavis.epizy.com/maquina_de_coser_singer_brilliance_6180_manual_en_espaol.pdfIn PDF document text
    • http://nawexox.epizy.com/99310179830.pdfIn PDF document text
    • http://pitareri.rf.gd/pdf_password_cracker_kali_linux.pdfIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/certificato_anamnestico_patente_modulo_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/67247032324.pdfIn PDF document text
    • http://detuzojezil.rf.gd/gewepiboxakozinosabu.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/1937767399.pdfIn PDF document text
    • http://saxarivoje.onlinewebshop.net/dupenixavep.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_off000149cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CF 5032 bytes
SHA-256: 60c500481980d56b3f9d1cb2d90409d05e16ef874156689931298cd25185f07d
font_01_sfnt_off00015adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADF 12480 bytes
SHA-256: 53bd28dfbf467a3c2b7c0128e816d18a0958d70a438dc1c5f1d33f830285b0e6

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