Malicious PDF — malware analysis report

Static analysis result for SHA-256 874be50cb6d019c6…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 03:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f2620755439d4ca65e84ddb179ef0149 SHA-1: ae465c3426160d11fc71195cb0f59ea76c1a076f SHA-256: 874be50cb6d019c658607743dff769579ceba75a0965bc85442d248a2f1add4b
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 for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by directing users to external sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit user interaction for malicious purposes.

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://seumenha.ru/award?keyword=como+baixar+pdf+editor PDF link annotation
    • http://pebogoginugi.iblogger.org/free_able_christmas_clipart_borders.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/bright_line_eating_14_day_challenge.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/jupaduv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_60465eb7adf4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_6012933e0fd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_60187d3728c82.pdfIn PDF document text
    • http://bigigog.22web.org/74130664012.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/68842480614.pdfIn PDF document text
    • http://fibilif.iblogger.org/88874087354.pdfIn PDF document text
    • http://rulazix.iblogger.org/57396050028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_603451a528bf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fc74c4e4f928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tozibuxadotoba.epizy.com/baal_veer_episode_958.pdfIn PDF document text
    • http://dopovis.myartsonline.com/lumodulomatedadevanorunak.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_c0a251c2a2974f10a327904ced9fa555.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/first_things_first_book.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_8d7774b0e6c342d9834ff5c8dfc19e36.pdf?index=trueIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/dolizagejupat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 4888 bytes
SHA-256: 267be6efff9cfad49cfee8156815bffa747b34f5c11715487adcd6f37ff29511
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10636 bytes
SHA-256: d5d40b2a9c7fca8df789de209ecbca4f047d08eb62752f247a3174270ab21eda
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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