Malicious PDF — malware analysis report

Static analysis result for SHA-256 c560494dea31a3ff…

MALICIOUS

PDF

81.6 KB Created: 2021-03-11 17:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bb7824a94b6e96ab08fcb2fce2cda491 SHA-1: 003960db5cc2ba2ea9dc64fc21665a7d23afa706 SHA-256: c560494dea31a3ff220ca3ab0d9143d4bc9b44ab3613d9d46d184223c60db760
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to downloading an Android application, indicated by the embedded URL and the document body text. The presence of multiple external URIs and link farm heuristics suggests a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing attack.

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://baarspo.ru/wix?keyword=download+ac+market+apk+for+android PDF link annotation
    • http://fortysgjdk.fun/30978660653rzywz.pdfIn PDF document text
    • http://216tilford.com/253562435969868j.pdfIn PDF document text
    • http://mihetos.xyz/towekaralubexukexeqb5c.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/57220473780.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/ratavifowanoxigaje.pdfIn PDF document text
    • http://hotita.space/peposuosmyi.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/barbing_tutorial.pdfIn PDF document text
    • http://digitalmicroteter.xyz/fozesuwupoxagiza87b9m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutesejib.onlinewebshop.net/deditaruwovigutukupux.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_1a7670cbd4484844bb21e55516ebe26e.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_ad9fcade1a2a452b8b9ed48bdd590c17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/23249351986.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/dizotitakapodipes.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_286559fa695e4fdc88cc231ce8a5800d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xopugup/dilusugesidebusotilopis.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/vocabulary_words_for_ielts_general.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_3eb95f0f9e504c78a8b1d1c886f4ec72.pdf?index=trueIn 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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 5280 bytes
SHA-256: 79450cbd96e657a089db250c6099b5c47730e7926d580c6e589cc10e8f6ed52c
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 10252 bytes
SHA-256: a0f36987f37eac70032612b8a63b1a1ef8ee53325970e83f38de446c5993cb96

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