Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d8016bb41a6cd6…

MALICIOUS

PDF

75.6 KB Created: 2021-01-21 04:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f4e50f58a59b7a14518fbf01a1f147d9 SHA-1: dc4818886454a314b0af8b9aeb85bdba2d4c6aee SHA-256: 05d8016bb41a6cd6781135dea4e1bd9c5cb0a4b335f9a60842f40cc1edd7cb76
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs points to a PDF file on 'epizy.com', which is often used for hosting malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=hardy+weinberg+problem+set+answer+key+biology+corner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460466/normal_5ff6752267607.pdfIn PDF document text
    • http://mabirimelu.iblogger.org/60093601312.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/8812218.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/dezuvil-dazirabuvapope-rakolimupekepas-nufexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490244/normal_6008a8f61b04e.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/mokivizulodobekilo.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/misofi.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/mimiviwelimiz.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/pagaxujeno.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/32db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fe644b4856d0.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://jawegoxizifiti.epizy.com/alt_balaji_series_mp4.pdfIn PDF document text
    • http://konajif.epizy.com/calpers_health_forms.pdfIn PDF document text
    • http://xitemefunugege.epizy.com/cg_movie_song_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/zopijuneveba.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/fun_worksheets_for_advanced_esl_students.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 5540 bytes
SHA-256: 188c0beefc3f3b716818f8b0227a36da3eec0e6da4df6bca5018269e15f44476
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10708 bytes
SHA-256: 6fe1587ebb1f41beb137b3f65ee334dbcfad2e8bc2707f685e1aa6bf48af46a2
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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